diff --git a/CHANGES.md b/CHANGES.md
index c2c287eb20..936e6b0ffe 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -7,11 +7,13 @@ Features ✨:
 Improvements 🙌:
  - Open an existing DM instead of creating a new one (#2319)
  - Ask for explicit user consent to send their contact details to the identity server (#2375)
+ - Handle events of type "m.room.server_acl" (#890)
 
 Bugfix 🐛:
  - Fix issue when restoring draft after sharing (#2287)
  - Fix issue when updating the avatar of a room (new avatar vanishing)
  - Discard change dialog displayed by mistake when avatar has been updated
+ - Registration: annoying error message scares every new user when they add an email (#2391)
 
 Translations 🗣:
  -
diff --git a/matrix-sdk-android/src/androidTest/java/org/matrix/android/sdk/common/CryptoTestHelper.kt b/matrix-sdk-android/src/androidTest/java/org/matrix/android/sdk/common/CryptoTestHelper.kt
index 1a9165ade4..cbb22daf0f 100644
--- a/matrix-sdk-android/src/androidTest/java/org/matrix/android/sdk/common/CryptoTestHelper.kt
+++ b/matrix-sdk-android/src/androidTest/java/org/matrix/android/sdk/common/CryptoTestHelper.kt
@@ -68,8 +68,8 @@ class CryptoTestHelper(private val mTestHelper: CommonTestHelper) {
         if (encryptedRoom) {
             val room = aliceSession.getRoom(roomId)!!
 
-            mTestHelper.doSync<Unit> {
-                room.enableEncryption(callback = it)
+            mTestHelper.runBlockingTest {
+                room.enableEncryption()
             }
         }
 
diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/extensions/Strings.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/extensions/Strings.kt
index a17e65b8e0..e264843ea4 100644
--- a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/extensions/Strings.kt
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/extensions/Strings.kt
@@ -22,3 +22,8 @@ fun CharSequence.ensurePrefix(prefix: CharSequence): CharSequence {
         else               -> "$prefix$this"
     }
 }
+
+/**
+ * Append a new line and then the provided string
+ */
+fun StringBuilder.appendNl(str: String) = append("\n").append(str)
diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/events/model/EventType.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/events/model/EventType.kt
index 82dea81a5b..0a7f3ff09f 100644
--- a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/events/model/EventType.kt
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/events/model/EventType.kt
@@ -56,6 +56,7 @@ object EventType {
     const val STATE_ROOM_RELATED_GROUPS = "m.room.related_groups"
     const val STATE_ROOM_PINNED_EVENT = "m.room.pinned_events"
     const val STATE_ROOM_ENCRYPTION = "m.room.encryption"
+    const val STATE_ROOM_SERVER_ACL = "m.room.server_acl"
 
     // Call Events
     const val CALL_INVITE = "m.call.invite"
diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/room/crypto/RoomCryptoService.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/room/crypto/RoomCryptoService.kt
index e7e6bacc22..1251fd9857 100644
--- a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/room/crypto/RoomCryptoService.kt
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/room/crypto/RoomCryptoService.kt
@@ -16,7 +16,6 @@
 
 package org.matrix.android.sdk.api.session.room.crypto
 
-import org.matrix.android.sdk.api.MatrixCallback
 import org.matrix.android.sdk.internal.crypto.MXCRYPTO_ALGORITHM_MEGOLM
 
 interface RoomCryptoService {
@@ -30,6 +29,5 @@ interface RoomCryptoService {
     /**
      * Enable encryption of the room
      */
-    fun enableEncryption(algorithm: String = MXCRYPTO_ALGORITHM_MEGOLM,
-                         callback: MatrixCallback<Unit>)
+    suspend fun enableEncryption(algorithm: String = MXCRYPTO_ALGORITHM_MEGOLM)
 }
diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/room/model/RoomServerAclContent.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/room/model/RoomServerAclContent.kt
new file mode 100644
index 0000000000..92078054b7
--- /dev/null
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/room/model/RoomServerAclContent.kt
@@ -0,0 +1,59 @@
+/*
+ * Copyright 2020 The Matrix.org Foundation C.I.C.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.matrix.android.sdk.api.session.room.model
+
+import com.squareup.moshi.Json
+import com.squareup.moshi.JsonClass
+
+/**
+ * Class representing the EventType.STATE_ROOM_SERVER_ACL state event content
+ * Ref: https://matrix.org/docs/spec/client_server/r0.6.1#m-room-server-acl
+ */
+@JsonClass(generateAdapter = true)
+data class RoomServerAclContent(
+        /**
+         * True to allow server names that are IP address literals. False to deny.
+         * Defaults to true if missing or otherwise not a boolean.
+         * This is strongly recommended to be set to false as servers running with IP literal names are strongly
+         * discouraged in order to require legitimate homeservers to be backed by a valid registered domain name.
+         */
+        @Json(name = "allow_ip_literals")
+        val allowIpLiterals: Boolean = true,
+
+        /**
+         * The server names to allow in the room, excluding any port information. Wildcards may be used to cover
+         * a wider range of hosts, where * matches zero or more characters and ? matches exactly one character.
+         *
+         * This defaults to an empty list when not provided, effectively disallowing every server.
+         */
+        @Json(name = "allow")
+        val allowList: List<String> = emptyList(),
+
+        /**
+         * The server names to disallow in the room, excluding any port information. Wildcards may be used to cover
+         * a wider range of hosts, where * matches zero or more characters and ? matches exactly one character.
+         *
+         * This defaults to an empty list when not provided.
+         */
+        @Json(name = "deny")
+        val denyList: List<String> = emptyList()
+
+) {
+    companion object {
+        const val ALL = "*"
+    }
+}
diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/room/notification/RoomPushRuleService.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/room/notification/RoomPushRuleService.kt
index 32d6033578..eb822c68ac 100644
--- a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/room/notification/RoomPushRuleService.kt
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/room/notification/RoomPushRuleService.kt
@@ -17,12 +17,10 @@
 package org.matrix.android.sdk.api.session.room.notification
 
 import androidx.lifecycle.LiveData
-import org.matrix.android.sdk.api.MatrixCallback
-import org.matrix.android.sdk.api.util.Cancelable
 
 interface RoomPushRuleService {
 
     fun getLiveRoomNotificationState(): LiveData<RoomNotificationState>
 
-    fun setRoomNotificationState(roomNotificationState: RoomNotificationState, matrixCallback: MatrixCallback<Unit>): Cancelable
+    suspend fun setRoomNotificationState(roomNotificationState: RoomNotificationState)
 }
diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/room/reporting/ReportingService.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/room/reporting/ReportingService.kt
index 0ccdfd1d3c..a444e2346e 100644
--- a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/room/reporting/ReportingService.kt
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/room/reporting/ReportingService.kt
@@ -16,9 +16,6 @@
 
 package org.matrix.android.sdk.api.session.room.reporting
 
-import org.matrix.android.sdk.api.MatrixCallback
-import org.matrix.android.sdk.api.util.Cancelable
-
 /**
  * This interface defines methods to report content of an event.
  */
@@ -28,5 +25,5 @@ interface ReportingService {
      * Report content
      * Ref: https://matrix.org/docs/spec/client_server/latest#post-matrix-client-r0-rooms-roomid-report-eventid
      */
-    fun reportContent(eventId: String, score: Int, reason: String, callback: MatrixCallback<Unit>): Cancelable
+    suspend fun reportContent(eventId: String, score: Int, reason: String)
 }
diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/room/tags/TagsService.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/room/tags/TagsService.kt
index 3278c640de..69fde61f90 100644
--- a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/room/tags/TagsService.kt
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/room/tags/TagsService.kt
@@ -16,9 +16,6 @@
 
 package org.matrix.android.sdk.api.session.room.tags
 
-import org.matrix.android.sdk.api.MatrixCallback
-import org.matrix.android.sdk.api.util.Cancelable
-
 /**
  * This interface defines methods to handle tags of a room. It's implemented at the room level.
  */
@@ -26,10 +23,10 @@ interface TagsService {
     /**
      * Add a tag to a room
      */
-    fun addTag(tag: String, order: Double?, callback: MatrixCallback<Unit>): Cancelable
+    suspend fun addTag(tag: String, order: Double?)
 
     /**
      * Remove tag from a room
      */
-    fun deleteTag(tag: String, callback: MatrixCallback<Unit>): Cancelable
+    suspend fun deleteTag(tag: String)
 }
diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/DefaultRoom.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/DefaultRoom.kt
index 1338df6878..c7bb640f7c 100644
--- a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/DefaultRoom.kt
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/DefaultRoom.kt
@@ -101,13 +101,13 @@ internal class DefaultRoom @Inject constructor(override val roomId: String,
         return cryptoService.shouldEncryptForInvitedMembers(roomId)
     }
 
-    override fun enableEncryption(algorithm: String, callback: MatrixCallback<Unit>) {
+    override suspend fun enableEncryption(algorithm: String) {
         when {
             isEncrypted()                          -> {
-                callback.onFailure(IllegalStateException("Encryption is already enabled for this room"))
+                throw IllegalStateException("Encryption is already enabled for this room")
             }
             algorithm != MXCRYPTO_ALGORITHM_MEGOLM -> {
-                callback.onFailure(InvalidParameterException("Only MXCRYPTO_ALGORITHM_MEGOLM algorithm is supported"))
+                throw InvalidParameterException("Only MXCRYPTO_ALGORITHM_MEGOLM algorithm is supported")
             }
             else                                   -> {
                 val params = SendStateTask.Params(
@@ -118,11 +118,7 @@ internal class DefaultRoom @Inject constructor(override val roomId: String,
                                 "algorithm" to algorithm
                         ))
 
-                sendStateTask
-                        .configureWith(params) {
-                            this.callback = callback
-                        }
-                        .executeBy(taskExecutor)
+                sendStateTask.execute(params)
             }
         }
     }
diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/notification/DefaultRoomPushRuleService.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/notification/DefaultRoomPushRuleService.kt
index 8797b0c764..67ae55c066 100644
--- a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/notification/DefaultRoomPushRuleService.kt
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/notification/DefaultRoomPushRuleService.kt
@@ -21,21 +21,16 @@ import androidx.lifecycle.Transformations
 import com.squareup.inject.assisted.Assisted
 import com.squareup.inject.assisted.AssistedInject
 import com.zhuinden.monarchy.Monarchy
-import org.matrix.android.sdk.api.MatrixCallback
 import org.matrix.android.sdk.api.pushrules.RuleScope
 import org.matrix.android.sdk.api.session.room.notification.RoomNotificationState
 import org.matrix.android.sdk.api.session.room.notification.RoomPushRuleService
-import org.matrix.android.sdk.api.util.Cancelable
 import org.matrix.android.sdk.internal.database.model.PushRuleEntity
 import org.matrix.android.sdk.internal.database.query.where
 import org.matrix.android.sdk.internal.di.SessionDatabase
-import org.matrix.android.sdk.internal.task.TaskExecutor
-import org.matrix.android.sdk.internal.task.configureWith
 
 internal class DefaultRoomPushRuleService @AssistedInject constructor(@Assisted private val roomId: String,
                                                                       private val setRoomNotificationStateTask: SetRoomNotificationStateTask,
-                                                                      @SessionDatabase private val monarchy: Monarchy,
-                                                                      private val taskExecutor: TaskExecutor)
+                                                                      @SessionDatabase private val monarchy: Monarchy)
     : RoomPushRuleService {
 
     @AssistedInject.Factory
@@ -49,12 +44,8 @@ internal class DefaultRoomPushRuleService @AssistedInject constructor(@Assisted
         }
     }
 
-    override fun setRoomNotificationState(roomNotificationState: RoomNotificationState, matrixCallback: MatrixCallback<Unit>): Cancelable {
-        return setRoomNotificationStateTask
-                .configureWith(SetRoomNotificationStateTask.Params(roomId, roomNotificationState)) {
-                    this.callback = matrixCallback
-                }
-                .executeBy(taskExecutor)
+    override suspend fun setRoomNotificationState(roomNotificationState: RoomNotificationState) {
+        setRoomNotificationStateTask.execute(SetRoomNotificationStateTask.Params(roomId, roomNotificationState))
     }
 
     private fun getPushRuleForRoom(): LiveData<RoomPushRule?> {
diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/reporting/DefaultReportingService.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/reporting/DefaultReportingService.kt
index 384c544ee0..cac87a9d30 100644
--- a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/reporting/DefaultReportingService.kt
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/reporting/DefaultReportingService.kt
@@ -18,14 +18,9 @@ package org.matrix.android.sdk.internal.session.room.reporting
 
 import com.squareup.inject.assisted.Assisted
 import com.squareup.inject.assisted.AssistedInject
-import org.matrix.android.sdk.api.MatrixCallback
 import org.matrix.android.sdk.api.session.room.reporting.ReportingService
-import org.matrix.android.sdk.api.util.Cancelable
-import org.matrix.android.sdk.internal.task.TaskExecutor
-import org.matrix.android.sdk.internal.task.configureWith
 
 internal class DefaultReportingService @AssistedInject constructor(@Assisted private val roomId: String,
-                                                                   private val taskExecutor: TaskExecutor,
                                                                    private val reportContentTask: ReportContentTask
 ) : ReportingService {
 
@@ -34,13 +29,8 @@ internal class DefaultReportingService @AssistedInject constructor(@Assisted pri
         fun create(roomId: String): ReportingService
     }
 
-    override fun reportContent(eventId: String, score: Int, reason: String, callback: MatrixCallback<Unit>): Cancelable {
+    override suspend fun reportContent(eventId: String, score: Int, reason: String) {
         val params = ReportContentTask.Params(roomId, eventId, score, reason)
-
-        return reportContentTask
-                .configureWith(params) {
-                    this.callback = callback
-                }
-                .executeBy(taskExecutor)
+        reportContentTask.execute(params)
     }
 }
diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/tags/DefaultTagsService.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/tags/DefaultTagsService.kt
index 932cb5d67e..d6c02f0a49 100644
--- a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/tags/DefaultTagsService.kt
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/tags/DefaultTagsService.kt
@@ -18,15 +18,10 @@ package org.matrix.android.sdk.internal.session.room.tags
 
 import com.squareup.inject.assisted.Assisted
 import com.squareup.inject.assisted.AssistedInject
-import org.matrix.android.sdk.api.MatrixCallback
 import org.matrix.android.sdk.api.session.room.tags.TagsService
-import org.matrix.android.sdk.api.util.Cancelable
-import org.matrix.android.sdk.internal.task.TaskExecutor
-import org.matrix.android.sdk.internal.task.configureWith
 
 internal class DefaultTagsService @AssistedInject constructor(
         @Assisted private val roomId: String,
-        private val taskExecutor: TaskExecutor,
         private val addTagToRoomTask: AddTagToRoomTask,
         private val deleteTagFromRoomTask: DeleteTagFromRoomTask
 ) : TagsService {
@@ -36,21 +31,13 @@ internal class DefaultTagsService @AssistedInject constructor(
         fun create(roomId: String): TagsService
     }
 
-    override fun addTag(tag: String, order: Double?, callback: MatrixCallback<Unit>): Cancelable {
+    override suspend fun addTag(tag: String, order: Double?) {
         val params = AddTagToRoomTask.Params(roomId, tag, order)
-        return addTagToRoomTask
-                .configureWith(params) {
-                    this.callback = callback
-                }
-                .executeBy(taskExecutor)
+        addTagToRoomTask.execute(params)
     }
 
-    override fun deleteTag(tag: String, callback: MatrixCallback<Unit>): Cancelable {
+    override suspend fun deleteTag(tag: String) {
         val params = DeleteTagFromRoomTask.Params(roomId, tag)
-        return deleteTagFromRoomTask
-                .configureWith(params) {
-                    this.callback = callback
-                }
-                .executeBy(taskExecutor)
+        deleteTagFromRoomTask.execute(params)
     }
 }
diff --git a/matrix-sdk-android/src/main/res/values/strings.xml b/matrix-sdk-android/src/main/res/values/strings.xml
index 27f083269f..de30a64c32 100644
--- a/matrix-sdk-android/src/main/res/values/strings.xml
+++ b/matrix-sdk-android/src/main/res/values/strings.xml
@@ -72,6 +72,23 @@
     <string name="notice_room_update_by_you">You upgraded this room.</string>
     <string name="notice_direct_room_update">%s upgraded here.</string>
     <string name="notice_direct_room_update_by_you">You upgraded here.</string>
+    <string name="notice_room_server_acl_set_title">%s set the server ACLs for this room.</string>
+    <string name="notice_room_server_acl_set_title_by_you">You set the server ACLs for this room.</string>
+    <string name="notice_room_server_acl_set_banned">• Server matching %s are banned.</string>
+    <string name="notice_room_server_acl_set_allowed">• Server matching %s are allowed.</string>
+    <string name="notice_room_server_acl_set_ip_literals_allowed">• Server matching IP literals are allowed.</string>
+    <string name="notice_room_server_acl_set_ip_literals_not_allowed">• Server matching IP literals are banned.</string>
+
+    <string name="notice_room_server_acl_updated_title">%s changed the server ACLs for this room.</string>
+    <string name="notice_room_server_acl_updated_title_by_you">You changed the server ACLs for this room.</string>
+    <string name="notice_room_server_acl_updated_banned">• Server matching %s are now banned.</string>
+    <string name="notice_room_server_acl_updated_was_banned">• Server matching %s were removed from the ban list.</string>
+    <string name="notice_room_server_acl_updated_allowed">• Server matching %s are now allowed.</string>
+    <string name="notice_room_server_acl_updated_was_allowed">• Server matching %s were removed from the allowed list.</string>
+    <string name="notice_room_server_acl_updated_ip_literals_allowed">• Server matching IP literals are now allowed.</string>
+    <string name="notice_room_server_acl_updated_ip_literals_not_allowed">• Server matching IP literals are now banned.</string>
+    <string name="notice_room_server_acl_updated_no_change">No change.</string>
+    <string name="notice_room_server_acl_allow_is_empty">🎉 All servers are banned from participating! This room can no longer be used.</string>
 
     <string name="notice_requested_voip_conference">%1$s requested a VoIP conference</string>
     <string name="notice_requested_voip_conference_by_you">You requested a VoIP conference</string>
diff --git a/vector/src/main/java/im/vector/app/features/home/room/detail/RoomDetailViewModel.kt b/vector/src/main/java/im/vector/app/features/home/room/detail/RoomDetailViewModel.kt
index 102a0673d4..1f22406883 100644
--- a/vector/src/main/java/im/vector/app/features/home/room/detail/RoomDetailViewModel.kt
+++ b/vector/src/main/java/im/vector/app/features/home/room/detail/RoomDetailViewModel.kt
@@ -99,6 +99,7 @@ import org.matrix.android.sdk.rx.rx
 import org.matrix.android.sdk.rx.unwrap
 import timber.log.Timber
 import java.io.File
+import java.lang.Exception
 import java.util.UUID
 import java.util.concurrent.TimeUnit
 import java.util.concurrent.atomic.AtomicBoolean
@@ -1112,15 +1113,15 @@ class RoomDetailViewModel @AssistedInject constructor(
     }
 
     private fun handleReportContent(action: RoomDetailAction.ReportContent) {
-        room.reportContent(action.eventId, -100, action.reason, object : MatrixCallback<Unit> {
-            override fun onSuccess(data: Unit) {
-                _viewEvents.post(RoomDetailViewEvents.ActionSuccess(action))
+        viewModelScope.launch {
+            val event = try {
+                room.reportContent(action.eventId, -100, action.reason)
+                RoomDetailViewEvents.ActionSuccess(action)
+            } catch (failure: Exception) {
+                RoomDetailViewEvents.ActionFailure(action, failure)
             }
-
-            override fun onFailure(failure: Throwable) {
-                _viewEvents.post(RoomDetailViewEvents.ActionFailure(action, failure))
-            }
-        })
+            _viewEvents.post(event)
+        }
     }
 
     private fun handleIgnoreUser(action: RoomDetailAction.IgnoreUser) {
diff --git a/vector/src/main/java/im/vector/app/features/home/room/detail/timeline/action/MessageActionsViewModel.kt b/vector/src/main/java/im/vector/app/features/home/room/detail/timeline/action/MessageActionsViewModel.kt
index 0d1e2261cd..8b0b905805 100644
--- a/vector/src/main/java/im/vector/app/features/home/room/detail/timeline/action/MessageActionsViewModel.kt
+++ b/vector/src/main/java/im/vector/app/features/home/room/detail/timeline/action/MessageActionsViewModel.kt
@@ -186,6 +186,7 @@ class MessageActionsViewModel @AssistedInject constructor(@Assisted
             EventType.STATE_ROOM_ALIASES,
             EventType.STATE_ROOM_CANONICAL_ALIAS,
             EventType.STATE_ROOM_HISTORY_VISIBILITY,
+            EventType.STATE_ROOM_SERVER_ACL,
             EventType.CALL_INVITE,
             EventType.CALL_CANDIDATES,
             EventType.CALL_HANGUP,
diff --git a/vector/src/main/java/im/vector/app/features/home/room/detail/timeline/factory/TimelineItemFactory.kt b/vector/src/main/java/im/vector/app/features/home/room/detail/timeline/factory/TimelineItemFactory.kt
index 1a4db3bdfc..575f28b610 100644
--- a/vector/src/main/java/im/vector/app/features/home/room/detail/timeline/factory/TimelineItemFactory.kt
+++ b/vector/src/main/java/im/vector/app/features/home/room/detail/timeline/factory/TimelineItemFactory.kt
@@ -57,6 +57,7 @@ class TimelineItemFactory @Inject constructor(private val messageItemFactory: Me
                 EventType.STATE_ROOM_CANONICAL_ALIAS,
                 EventType.STATE_ROOM_JOIN_RULES,
                 EventType.STATE_ROOM_HISTORY_VISIBILITY,
+                EventType.STATE_ROOM_SERVER_ACL,
                 EventType.STATE_ROOM_GUEST_ACCESS,
                 EventType.STATE_ROOM_WIDGET_LEGACY,
                 EventType.STATE_ROOM_WIDGET,
diff --git a/vector/src/main/java/im/vector/app/features/home/room/detail/timeline/format/NoticeEventFormatter.kt b/vector/src/main/java/im/vector/app/features/home/room/detail/timeline/format/NoticeEventFormatter.kt
index 8055ef9a99..c4cc2e87b0 100644
--- a/vector/src/main/java/im/vector/app/features/home/room/detail/timeline/format/NoticeEventFormatter.kt
+++ b/vector/src/main/java/im/vector/app/features/home/room/detail/timeline/format/NoticeEventFormatter.kt
@@ -19,6 +19,8 @@ package im.vector.app.features.home.room.detail.timeline.format
 import im.vector.app.ActiveSessionDataSource
 import im.vector.app.R
 import im.vector.app.core.resources.StringProvider
+import im.vector.app.features.settings.VectorPreferences
+import org.matrix.android.sdk.api.extensions.appendNl
 import org.matrix.android.sdk.api.extensions.orFalse
 import org.matrix.android.sdk.api.session.events.model.Event
 import org.matrix.android.sdk.api.session.events.model.EventType
@@ -35,6 +37,7 @@ import org.matrix.android.sdk.api.session.room.model.RoomJoinRules
 import org.matrix.android.sdk.api.session.room.model.RoomJoinRulesContent
 import org.matrix.android.sdk.api.session.room.model.RoomMemberContent
 import org.matrix.android.sdk.api.session.room.model.RoomNameContent
+import org.matrix.android.sdk.api.session.room.model.RoomServerAclContent
 import org.matrix.android.sdk.api.session.room.model.RoomSummary
 import org.matrix.android.sdk.api.session.room.model.RoomThirdPartyInviteContent
 import org.matrix.android.sdk.api.session.room.model.RoomTopicContent
@@ -48,9 +51,12 @@ import org.matrix.android.sdk.internal.crypto.model.event.EncryptionEventContent
 import timber.log.Timber
 import javax.inject.Inject
 
-class NoticeEventFormatter @Inject constructor(private val activeSessionDataSource: ActiveSessionDataSource,
-                                               private val roomHistoryVisibilityFormatter: RoomHistoryVisibilityFormatter,
-                                               private val sp: StringProvider) {
+class NoticeEventFormatter @Inject constructor(
+        private val activeSessionDataSource: ActiveSessionDataSource,
+        private val roomHistoryVisibilityFormatter: RoomHistoryVisibilityFormatter,
+        private val vectorPreferences: VectorPreferences,
+        private val sp: StringProvider
+) {
 
     private val currentUserId: String?
         get() = activeSessionDataSource.currentValue?.orNull()?.myUserId
@@ -72,6 +78,7 @@ class NoticeEventFormatter @Inject constructor(private val activeSessionDataSour
             EventType.STATE_ROOM_CANONICAL_ALIAS    -> formatRoomCanonicalAliasEvent(timelineEvent.root, timelineEvent.senderInfo.disambiguatedDisplayName)
             EventType.STATE_ROOM_HISTORY_VISIBILITY ->
                 formatRoomHistoryVisibilityEvent(timelineEvent.root, timelineEvent.senderInfo.disambiguatedDisplayName, rs)
+            EventType.STATE_ROOM_SERVER_ACL         -> formatRoomServerAclEvent(timelineEvent.root, timelineEvent.senderInfo.disambiguatedDisplayName)
             EventType.STATE_ROOM_GUEST_ACCESS       -> formatRoomGuestAccessEvent(timelineEvent.root, timelineEvent.senderInfo.disambiguatedDisplayName, rs)
             EventType.STATE_ROOM_ENCRYPTION         -> formatRoomEncryptionEvent(timelineEvent.root, timelineEvent.senderInfo.disambiguatedDisplayName)
             EventType.STATE_ROOM_WIDGET,
@@ -383,6 +390,79 @@ class NoticeEventFormatter @Inject constructor(private val activeSessionDataSour
         }
     }
 
+    private fun formatRoomServerAclEvent(event: Event, senderName: String?): String? {
+        val eventContent = event.getClearContent().toModel<RoomServerAclContent>() ?: return null
+        val prevEventContent = event.resolvedPrevContent()?.toModel<RoomServerAclContent>()
+
+        return buildString {
+            // Title
+            append(if (prevEventContent == null) {
+                if (event.isSentByCurrentUser()) {
+                    sp.getString(R.string.notice_room_server_acl_set_title_by_you)
+                } else {
+                    sp.getString(R.string.notice_room_server_acl_set_title, senderName)
+                }
+            } else {
+                if (event.isSentByCurrentUser()) {
+                    sp.getString(R.string.notice_room_server_acl_updated_title_by_you)
+                } else {
+                    sp.getString(R.string.notice_room_server_acl_updated_title, senderName)
+                }
+            })
+            if (eventContent.allowList.isEmpty()) {
+                // Special case for stuck room
+                appendNl(sp.getString(R.string.notice_room_server_acl_allow_is_empty))
+            } else if (vectorPreferences.developerMode()) {
+                // Details, only in developer mode
+                appendAclDetails(eventContent, prevEventContent)
+            }
+        }
+    }
+
+    private fun StringBuilder.appendAclDetails(eventContent: RoomServerAclContent, prevEventContent: RoomServerAclContent?) {
+        if (prevEventContent == null) {
+            eventContent.allowList.forEach { appendNl(sp.getString(R.string.notice_room_server_acl_set_allowed, it)) }
+            eventContent.denyList.forEach { appendNl(sp.getString(R.string.notice_room_server_acl_set_banned, it)) }
+            if (eventContent.allowIpLiterals) {
+                appendNl(sp.getString(R.string.notice_room_server_acl_set_ip_literals_allowed))
+            } else {
+                appendNl(sp.getString(R.string.notice_room_server_acl_set_ip_literals_not_allowed))
+            }
+        } else {
+            // Display only diff
+            var hasChanged = false
+            // New allowed servers
+            (eventContent.allowList - prevEventContent.allowList)
+                    .also { hasChanged = hasChanged || it.isNotEmpty() }
+                    .forEach { appendNl(sp.getString(R.string.notice_room_server_acl_updated_allowed, it)) }
+            // Removed allowed servers
+            (prevEventContent.allowList - eventContent.allowList)
+                    .also { hasChanged = hasChanged || it.isNotEmpty() }
+                    .forEach { appendNl(sp.getString(R.string.notice_room_server_acl_updated_was_allowed, it)) }
+            // New denied servers
+            (eventContent.denyList - prevEventContent.denyList)
+                    .also { hasChanged = hasChanged || it.isNotEmpty() }
+                    .forEach { appendNl(sp.getString(R.string.notice_room_server_acl_updated_banned, it)) }
+            // Removed denied servers
+            (prevEventContent.denyList - eventContent.denyList)
+                    .also { hasChanged = hasChanged || it.isNotEmpty() }
+                    .forEach { appendNl(sp.getString(R.string.notice_room_server_acl_updated_was_banned, it)) }
+
+            if (prevEventContent.allowIpLiterals != eventContent.allowIpLiterals) {
+                hasChanged = true
+                if (eventContent.allowIpLiterals) {
+                    appendNl(sp.getString(R.string.notice_room_server_acl_updated_ip_literals_allowed))
+                } else {
+                    appendNl(sp.getString(R.string.notice_room_server_acl_updated_ip_literals_not_allowed))
+                }
+            }
+
+            if (!hasChanged) {
+                appendNl(sp.getString(R.string.notice_room_server_acl_updated_no_change))
+            }
+        }
+    }
+
     private fun formatRoomCanonicalAliasEvent(event: Event, senderName: String?): String? {
         val eventContent: RoomCanonicalAliasContent? = event.getClearContent().toModel()
         val canonicalAlias = eventContent?.canonicalAlias
diff --git a/vector/src/main/java/im/vector/app/features/home/room/detail/timeline/helper/TimelineDisplayableEvents.kt b/vector/src/main/java/im/vector/app/features/home/room/detail/timeline/helper/TimelineDisplayableEvents.kt
index 14b8c12fee..4fcac6c7f7 100644
--- a/vector/src/main/java/im/vector/app/features/home/room/detail/timeline/helper/TimelineDisplayableEvents.kt
+++ b/vector/src/main/java/im/vector/app/features/home/room/detail/timeline/helper/TimelineDisplayableEvents.kt
@@ -33,6 +33,7 @@ object TimelineDisplayableEvents {
             EventType.STATE_ROOM_ALIASES,
             EventType.STATE_ROOM_CANONICAL_ALIAS,
             EventType.STATE_ROOM_HISTORY_VISIBILITY,
+            EventType.STATE_ROOM_SERVER_ACL,
             EventType.STATE_ROOM_POWER_LEVELS,
             EventType.CALL_INVITE,
             EventType.CALL_HANGUP,
diff --git a/vector/src/main/java/im/vector/app/features/home/room/list/RoomListViewModel.kt b/vector/src/main/java/im/vector/app/features/home/room/list/RoomListViewModel.kt
index c32629d6ae..84652506cd 100644
--- a/vector/src/main/java/im/vector/app/features/home/room/list/RoomListViewModel.kt
+++ b/vector/src/main/java/im/vector/app/features/home/room/list/RoomListViewModel.kt
@@ -33,9 +33,9 @@ import org.matrix.android.sdk.api.session.Session
 import org.matrix.android.sdk.api.session.room.model.Membership
 import org.matrix.android.sdk.api.session.room.model.RoomSummary
 import org.matrix.android.sdk.api.session.room.model.tag.RoomTag
-import org.matrix.android.sdk.internal.util.awaitCallback
 import org.matrix.android.sdk.rx.rx
 import timber.log.Timber
+import java.lang.Exception
 import javax.inject.Inject
 
 class RoomListViewModel @Inject constructor(initialState: RoomListViewState,
@@ -169,11 +169,16 @@ class RoomListViewModel @Inject constructor(initialState: RoomListViewState,
     }
 
     private fun handleChangeNotificationMode(action: RoomListAction.ChangeRoomNotificationState) {
-        session.getRoom(action.roomId)?.setRoomNotificationState(action.notificationState, object : MatrixCallback<Unit> {
-            override fun onFailure(failure: Throwable) {
-                _viewEvents.post(RoomListViewEvents.Failure(failure))
+        val room = session.getRoom(action.roomId)
+        if (room != null) {
+            viewModelScope.launch {
+                try {
+                    room.setRoomNotificationState(action.notificationState)
+                } catch (failure: Exception) {
+                    _viewEvents.post(RoomListViewEvents.Failure(failure))
+                }
             }
-        })
+        }
     }
 
     private fun handleToggleTag(action: RoomListAction.ToggleTag) {
@@ -185,17 +190,13 @@ class RoomListViewModel @Inject constructor(initialState: RoomListViewState,
                         action.tag.otherTag()
                                 ?.takeIf { room.roomSummary()?.hasTag(it).orFalse() }
                                 ?.let { tagToRemove ->
-                                    awaitCallback<Unit> { room.deleteTag(tagToRemove, it) }
+                                    room.deleteTag(tagToRemove)
                                 }
 
                         // Set the tag. We do not handle the order for the moment
-                        awaitCallback<Unit> {
-                            room.addTag(action.tag, 0.5, it)
-                        }
+                        room.addTag(action.tag, 0.5)
                     } else {
-                        awaitCallback<Unit> {
-                            room.deleteTag(action.tag, it)
-                        }
+                        room.deleteTag(action.tag)
                     }
                 } catch (failure: Throwable) {
                     _viewEvents.post(RoomListViewEvents.Failure(failure))
diff --git a/vector/src/main/java/im/vector/app/features/login/AbstractLoginFragment.kt b/vector/src/main/java/im/vector/app/features/login/AbstractLoginFragment.kt
index c6658925af..e3c1aa7b12 100644
--- a/vector/src/main/java/im/vector/app/features/login/AbstractLoginFragment.kt
+++ b/vector/src/main/java/im/vector/app/features/login/AbstractLoginFragment.kt
@@ -69,6 +69,11 @@ abstract class AbstractLoginFragment : VectorBaseFragment(), OnBackPressed {
     }
 
     override fun showFailure(throwable: Throwable) {
+        // Only the resumed Fragment can eventually show the error, to avoid multiple dialog display
+        if (!isResumed) {
+            return
+        }
+
         when (throwable) {
             is Failure.Cancelled                      ->
                 /* Ignore this error, user has cancelled the action */
diff --git a/vector/src/main/java/im/vector/app/features/login/LoginViewModel.kt b/vector/src/main/java/im/vector/app/features/login/LoginViewModel.kt
index 81d6a78123..1f47916538 100644
--- a/vector/src/main/java/im/vector/app/features/login/LoginViewModel.kt
+++ b/vector/src/main/java/im/vector/app/features/login/LoginViewModel.kt
@@ -207,7 +207,6 @@ class LoginViewModel @AssistedInject constructor(
     private fun handleCheckIfEmailHasBeenValidated(action: LoginAction.CheckIfEmailHasBeenValidated) {
         // We do not want the common progress bar to be displayed, so we do not change asyncRegistration value in the state
         currentTask?.cancel()
-        currentTask = null
         currentTask = registrationWizard?.checkIfEmailHasBeenValidated(action.delayMillis, registrationCallback)
     }
 
diff --git a/vector/src/main/java/im/vector/app/features/roomprofile/RoomProfileViewModel.kt b/vector/src/main/java/im/vector/app/features/roomprofile/RoomProfileViewModel.kt
index e927ec9876..a78bf472d6 100644
--- a/vector/src/main/java/im/vector/app/features/roomprofile/RoomProfileViewModel.kt
+++ b/vector/src/main/java/im/vector/app/features/roomprofile/RoomProfileViewModel.kt
@@ -102,11 +102,13 @@ class RoomProfileViewModel @AssistedInject constructor(
     }
 
     private fun handleChangeNotificationMode(action: RoomProfileAction.ChangeRoomNotificationState) {
-        room.setRoomNotificationState(action.notificationState, object : MatrixCallback<Unit> {
-            override fun onFailure(failure: Throwable) {
+        viewModelScope.launch {
+            try {
+                room.setRoomNotificationState(action.notificationState)
+            } catch (failure: Throwable) {
                 _viewEvents.post(RoomProfileViewEvents.Failure(failure))
             }
-        })
+        }
     }
 
     private fun handleLeaveRoom() {
diff --git a/vector/src/main/java/im/vector/app/features/roomprofile/settings/RoomSettingsViewModel.kt b/vector/src/main/java/im/vector/app/features/roomprofile/settings/RoomSettingsViewModel.kt
index 4e540f867e..086ce93bb0 100644
--- a/vector/src/main/java/im/vector/app/features/roomprofile/settings/RoomSettingsViewModel.kt
+++ b/vector/src/main/java/im/vector/app/features/roomprofile/settings/RoomSettingsViewModel.kt
@@ -17,6 +17,7 @@
 package im.vector.app.features.roomprofile.settings
 
 import androidx.core.net.toFile
+import androidx.lifecycle.viewModelScope
 import com.airbnb.mvrx.FragmentViewModelContext
 import com.airbnb.mvrx.MvRxViewModelFactory
 import com.airbnb.mvrx.ViewModelContext
@@ -27,7 +28,7 @@ import im.vector.app.core.platform.VectorViewModel
 import im.vector.app.features.powerlevel.PowerLevelsObservableFactory
 import io.reactivex.Completable
 import io.reactivex.Observable
-import org.matrix.android.sdk.api.MatrixCallback
+import kotlinx.coroutines.launch
 import org.matrix.android.sdk.api.extensions.tryOrNull
 import org.matrix.android.sdk.api.query.QueryStringValue
 import org.matrix.android.sdk.api.session.Session
@@ -228,16 +229,13 @@ class RoomSettingsViewModel @AssistedInject constructor(@Assisted initialState:
     private fun handleEnableEncryption() {
         postLoading(true)
 
-        room.enableEncryption(callback = object : MatrixCallback<Unit> {
-            override fun onFailure(failure: Throwable) {
-                postLoading(false)
+        viewModelScope.launch {
+            val result = runCatching { room.enableEncryption() }
+            postLoading(false)
+            result.onFailure { failure ->
                 _viewEvents.post(RoomSettingsViewEvents.Failure(failure))
             }
-
-            override fun onSuccess(data: Unit) {
-                postLoading(false)
-            }
-        })
+        }
     }
 
     private fun postLoading(isLoading: Boolean) {