diff --git a/spec/unit/matrix-client.spec.js b/spec/unit/matrix-client.spec.js
index 82e166f67..6d4024430 100644
--- a/spec/unit/matrix-client.spec.js
+++ b/spec/unit/matrix-client.spec.js
@@ -728,4 +728,128 @@ describe("MatrixClient", function() {
             expect(httpLookups.length).toEqual(0);
         });
     });
+
+    describe("sendEvent", () => {
+        const roomId = "!room:example.org";
+        const body = "This is the body";
+        const content = { body };
+
+        it("overload without threadId works", async () => {
+            const eventId = "$eventId:example.org";
+            const txnId = client.makeTxnId();
+            httpLookups = [{
+                method: "PUT",
+                path: `/rooms/${encodeURIComponent(roomId)}/send/m.room.message/${txnId}`,
+                data: { event_id: eventId },
+                expectBody: content,
+            }];
+
+            await client.sendEvent(roomId, EventType.RoomMessage, content, txnId);
+        });
+
+        it("overload with null threadId works", async () => {
+            const eventId = "$eventId:example.org";
+            const txnId = client.makeTxnId();
+            httpLookups = [{
+                method: "PUT",
+                path: `/rooms/${encodeURIComponent(roomId)}/send/m.room.message/${txnId}`,
+                data: { event_id: eventId },
+                expectBody: content,
+            }];
+
+            await client.sendEvent(roomId, null, EventType.RoomMessage, content, txnId);
+        });
+
+        it("overload with threadId works", async () => {
+            const eventId = "$eventId:example.org";
+            const txnId = client.makeTxnId();
+            httpLookups = [{
+                method: "PUT",
+                path: `/rooms/${encodeURIComponent(roomId)}/send/m.room.message/${txnId}`,
+                data: { event_id: eventId },
+                expectBody: content,
+            }];
+
+            await client.sendEvent(roomId, "$threadId:server", EventType.RoomMessage, content, txnId);
+        });
+    });
+
+    describe("redactEvent", () => {
+        const roomId = "!room:example.org";
+        const mockRoom = {
+            getMyMembership: () => "join",
+            currentState: {
+                getStateEvents: (eventType, stateKey) => {
+                    if (eventType === EventType.RoomEncryption) {
+                        expect(stateKey).toEqual("");
+                        return new MatrixEvent({ content: {} });
+                    } else {
+                        throw new Error("Unexpected event type or state key");
+                    }
+                },
+            },
+            threads: {
+                get: jest.fn(),
+            },
+            addPendingEvent: jest.fn(),
+            updatePendingEvent: jest.fn(),
+        };
+
+        beforeEach(() => {
+            client.getRoom = (getRoomId) => {
+                expect(getRoomId).toEqual(roomId);
+                return mockRoom;
+            };
+        });
+
+        it("overload without threadId works", async () => {
+            const eventId = "$eventId:example.org";
+            const txnId = client.makeTxnId();
+            httpLookups = [{
+                method: "PUT",
+                path: `/rooms/${encodeURIComponent(roomId)}/redact/${encodeURIComponent(eventId)}/${txnId}`,
+                data: { event_id: eventId },
+            }];
+
+            await client.redactEvent(roomId, eventId, txnId);
+        });
+
+        it("overload with null threadId works", async () => {
+            const eventId = "$eventId:example.org";
+            const txnId = client.makeTxnId();
+            httpLookups = [{
+                method: "PUT",
+                path: `/rooms/${encodeURIComponent(roomId)}/redact/${encodeURIComponent(eventId)}/${txnId}`,
+                data: { event_id: eventId },
+            }];
+
+            await client.redactEvent(roomId, null, eventId, txnId);
+        });
+
+        it("overload with threadId works", async () => {
+            const eventId = "$eventId:example.org";
+            const txnId = client.makeTxnId();
+            httpLookups = [{
+                method: "PUT",
+                path: `/rooms/${encodeURIComponent(roomId)}/redact/${encodeURIComponent(eventId)}/${txnId}`,
+                data: { event_id: eventId },
+            }];
+
+            await client.redactEvent(roomId, "$threadId:server", eventId, txnId);
+        });
+
+        it("does not get wrongly encrypted", async () => {
+            const eventId = "$eventId:example.org";
+            const txnId = client.makeTxnId();
+            const reason = "This is the redaction reason";
+            httpLookups = [{
+                method: "PUT",
+                path: `/rooms/${encodeURIComponent(roomId)}/redact/${encodeURIComponent(eventId)}/${txnId}`,
+                expectBody: { reason }, // NOT ENCRYPTED
+                data: { event_id: eventId },
+            }];
+
+            await client.redactEvent(roomId, eventId, txnId, { reason });
+        });
+    });
 });
diff --git a/src/client.ts b/src/client.ts
index b5d59936e..0859b1b4f 100644
--- a/src/client.ts
+++ b/src/client.ts
@@ -3726,6 +3726,12 @@ export class MatrixClient extends EventEmitter {
             return null;
         }
 
+        if (event.isRedaction()) {
+            // Redactions do not support encryption in the spec at this time,
+            // whilst it mostly worked in some clients, it wasn't compliant.
+            return null;
+        }
+
         if (!this.isRoomEncrypted(event.getRoomId())) {
             return null;
         }
@@ -3852,7 +3858,7 @@ export class MatrixClient extends EventEmitter {
         txnId?: string | Callback | IRedactOpts,
         cbOrOpts?: Callback | IRedactOpts,
     ): Promise<ISendEventResponse> {
-        if (!eventId || eventId.startsWith(EVENT_ID_PREFIX)) {
+        if (!eventId?.startsWith(EVENT_ID_PREFIX)) {
             cbOrOpts = txnId as (Callback | IRedactOpts);
             txnId = eventId;
             eventId = threadId;
@@ -3863,7 +3869,7 @@ export class MatrixClient extends EventEmitter {
         const callback = typeof (cbOrOpts) === 'function' ? cbOrOpts : undefined;
         return this.sendCompleteEvent(roomId, threadId, {
             type: EventType.RoomRedaction,
-            content: { reason: reason },
+            content: { reason },
             redacts: eventId,
         }, txnId as string, callback);
     }
diff --git a/src/models/event.ts b/src/models/event.ts
index f488d7434..df0ad5aec 100644
--- a/src/models/event.ts
+++ b/src/models/event.ts
@@ -771,7 +771,7 @@ export class MatrixEvent extends EventEmitter {
     private badEncryptedMessage(reason: string): IEventDecryptionResult {
         return {
             clearEvent: {
-                type: "m.room.message",
+                type: EventType.RoomMessage,
                 content: {
                     msgtype: "m.bad.encrypted",
                     body: "** Unable to decrypt: " + reason + " **",
@@ -818,7 +818,7 @@ export class MatrixEvent extends EventEmitter {
      * @return {boolean} True if this event is encrypted.
      */
     public isEncrypted(): boolean {
-        return !this.isState() && this.event.type === "m.room.encrypted";
+        return !this.isState() && this.event.type === EventType.RoomMessageEncrypted;
     }
 
     /**
@@ -989,7 +989,7 @@ export class MatrixEvent extends EventEmitter {
      * @return {boolean} True if this event is a redaction
      */
     public isRedaction(): boolean {
-        return this.getType() === "m.room.redaction";
+        return this.getType() === EventType.RoomRedaction;
     }
 
     /**
@@ -1371,15 +1371,15 @@ const REDACT_KEEP_KEYS = new Set([
 
 // a map from event type to the .content keys we keep when an event is redacted
 const REDACT_KEEP_CONTENT_MAP = {
-    'm.room.member': { 'membership': 1 },
-    'm.room.create': { 'creator': 1 },
-    'm.room.join_rules': { 'join_rule': 1 },
-    'm.room.power_levels': {
+    [EventType.RoomMember]: { 'membership': 1 },
+    [EventType.RoomCreate]: { 'creator': 1 },
+    [EventType.RoomJoinRules]: { 'join_rule': 1 },
+    [EventType.RoomPowerLevels]: {
         'ban': 1, 'events': 1, 'events_default': 1,
         'kick': 1, 'redact': 1, 'state_default': 1,
         'users': 1, 'users_default': 1,
     },
-    'm.room.aliases': { 'aliases': 1 },
+    [EventType.RoomAliases]: { 'aliases': 1 },
 };
 
 /**