diff --git a/packages/backend/src/queue/index.ts b/packages/backend/src/queue/index.ts
index 55b5676c3..f52660448 100644
--- a/packages/backend/src/queue/index.ts
+++ b/packages/backend/src/queue/index.ts
@@ -84,34 +84,47 @@ webhookDeliverQueue
 	.on('error', (job: any, err: Error) => webhookLogger.error(`error ${err}`, { job, e: renderError(err) }))
 	.on('stalled', (job) => webhookLogger.warn(`stalled ${getJobInfo(job)} to=${job.data.to}`));
 
-export function deliver(content: unknown, to: string | null) {
+export function deliver(content: IActivity|IActivity[], to: string | null) {
 	if (content == null) return null;
 	if (to == null) return null;
 
-	// extract user from the Activity
-	const userUri = content.actor;
-	if (!userUri) throw new Error("Cannot deliver activity without actor.");
-	const user = await new DbResolver().getUserFromApId(userUri);
-	if (!user) throw new Error("Actor not found, cannot deliver.");
-	if (user.host != null) throw new Error("Cannot deliver for remote actor.");
+	// group activities by actor
+	const contentArray = Array.isArray(content) ? content : [content];
+	let byActor = contentArray.reduce((acc, activity) => {
+		if (activity.actor == null) throw new Error("Cannot deliver activity without actor.");
+		if (!(activity.actor in acc)) {
+			acc[activity.actor] = [];
+		}
+		acc[activity.actor].push(activity);
+		return acc;
+	}, []);
 
-	const data = {
-		user: {
-			id: user.id,
-		},
-		content,
-		to,
-	};
+	// add groups to deliver queue
+	const dbResolver = new DbResolver();
+	for (const actor in byActor) {
+		// extract user from the Activity
+		const user = await dbResolver.getUserFromApId(actor);
+		if (!user) throw new Error("Actor not found, cannot deliver.");
+		if (user.host != null) throw new Error("Cannot deliver for remote actor.");
 
-	return deliverQueue.add(data, {
-		attempts: config.deliverJobMaxAttempts,
-		timeout: MINUTE,
-		backoff: {
-			type: 'apBackoff',
-		},
-		removeOnComplete: true,
-		removeOnFail: true,
-	});
+		// add item to deliver queue
+		const data = {
+			user: {
+				id: user.id,
+			},
+			byActor[actor],
+			to,
+		};
+		deliverQueue.add(data, {
+			attempts: config.deliverJobMaxAttempts,
+			timeout: MINUTE,
+			backoff: {
+				type: 'apBackoff',
+			},
+			removeOnComplete: true,
+			removeOnFail: true,
+		});
+	}
 }
 
 export function inbox(activity: IActivity, signature: httpSignature.IParsedSignature) {