diff --git a/src/Model/Contact.php b/src/Model/Contact.php
index 9afaf77fc0..d938ad29c2 100644
--- a/src/Model/Contact.php
+++ b/src/Model/Contact.php
@@ -2226,8 +2226,35 @@ class Contact extends BaseObject
 		return $redirect;
 	}
 
+	/**
+	 * Remove a contact from all groups
+	 *
+	 * @param integer $contact_id
+	 *
+	 * @return boolean Success
+	 */
 	public static function removeFromGroups($contact_id)
 	{
 		return DBA::delete('group_member', ['contact-id' => $contact_id]);
 	}
+
+	/**
+	 * Is the contact a forum?
+	 *
+	 * @param integer $contactid ID of the contact
+	 *
+	 * @return boolean "true" if it is a forum
+	 */
+	public static function isForum($contactid)
+	{
+		$fields = ['forum', 'prv'];
+		$condition = ['id' => $contactid];
+		$contact = DBA::selectFirst('contact', $fields, $condition);
+		if (!DBA::isResult($contact)) {
+			return false;
+		}
+
+		// Is it a forum?
+		return ($contact['forum'] || $contact['prv']);
+	}
 }
diff --git a/src/Model/Item.php b/src/Model/Item.php
index 964e94ddb9..4808b2d035 100644
--- a/src/Model/Item.php
+++ b/src/Model/Item.php
@@ -3592,4 +3592,31 @@ class Item extends BaseObject
 
 		return $ret;
 	}
+
+	/**
+	 * Is the given item array a post that is sent as starting post to a forum?
+	 *
+	 * @param array $item
+	 * @param array $owner
+	 *
+	 * @return boolean "true" when it is a forum post
+	 */
+	public static function isForumPost(array $item, array $owner = [])
+	{
+		if (empty($owner)) {
+			$owner = User::getOwnerDataById($item['uid']);
+			if (empty($owner)) {
+				return false;
+			}
+		}
+
+		if (($item['author-id'] == $item['owner-id']) ||
+			($owner['id'] == $item['contact-id']) ||
+			($item['uri'] != $item['parent-uri']) ||
+			$item['origin']) {
+			return false;
+		}
+
+		return Contact::isForum($item['contact-id']);
+	}
 }
diff --git a/src/Protocol/ActivityPub/Transmitter.php b/src/Protocol/ActivityPub/Transmitter.php
index f2df43e854..94012e4d63 100644
--- a/src/Protocol/ActivityPub/Transmitter.php
+++ b/src/Protocol/ActivityPub/Transmitter.php
@@ -303,15 +303,16 @@ class Transmitter
 	/**
 	 * Creates an array of permissions from an item thread
 	 *
-	 * @param array   $item
-	 * @param boolean $blindcopy
-	 * @param boolean $last_id
+	 * @param array   $item       Item array
+	 * @param boolean $blindcopy  addressing via "bcc" or "cc"?
+	 * @param integer $last_id    Last item id for adding receivers
+	 * @param boolean $forum_mode "true" means that we are sending content to a forum
 	 *
 	 * @return array with permission data
 	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 * @throws \ImagickException
 	 */
-	private static function createPermissionBlockForItem($item, $blindcopy, $last_id = 0)
+	private static function createPermissionBlockForItem($item, $blindcopy, $last_id = 0, $forum_mode = false)
 	{
 		if ($last_id == 0) {
 			$last_id = $item['id'];
@@ -399,7 +400,7 @@ class Transmitter
 						}
 					} else {
 						// Public thread parent post always are directed to the followes
-						if (!$item['private']) {
+						if (!$item['private'] && !$forum_mode) {
 							$data['cc'][] = $actor_profile['followers'];
 						}
 					}
@@ -515,18 +516,18 @@ class Transmitter
 	/**
 	 * Fetches an array of inboxes for the given item and user
 	 *
-	 * @param array   $item
-	 * @param integer $uid      User ID
-	 * @param boolean $personal fetch personal inboxes
-	 * @param integer $last_id Last item id for adding receivers
-	 *
+	 * @param array   $item       Item array
+	 * @param integer $uid        User ID
+	 * @param boolean $personal   fetch personal inboxes
+	 * @param integer $last_id    Last item id for adding receivers
+	 * @param boolean $forum_mode "true" means that we are sending content to a forum
 	 * @return array with inboxes
 	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 * @throws \ImagickException
 	 */
-	public static function fetchTargetInboxes($item, $uid, $personal = false, $last_id = 0)
+	public static function fetchTargetInboxes($item, $uid, $personal = false, $last_id = 0, $forum_mode = false)
 	{
-		$permissions = self::createPermissionBlockForItem($item, true, $last_id);
+		$permissions = self::createPermissionBlockForItem($item, true, $last_id, $forum_mode);
 		if (empty($permissions)) {
 			return [];
 		}
@@ -659,7 +660,7 @@ class Transmitter
 			return false;
 		}
 
-		if ($item['wall']) {
+		if ($item['wall'] && ($item['uri'] == $item['parent-uri'])) {
 			$owner = User::getOwnerDataById($item['uid']);
 			if (($owner['account-type'] == User::ACCOUNT_TYPE_COMMUNITY) && ($item['author-link'] != $owner['url'])) {
 				$type = 'Announce';
@@ -697,7 +698,12 @@ class Transmitter
 
 		$data['id'] = $item['uri'] . '#' . $type;
 		$data['type'] = $type;
-		$data['actor'] = $item['owner-link'];
+
+		if (Item::isForumPost($item) && ($type != 'Announce')) {
+			$data['actor'] = $item['author-link'];
+		} else {
+			$data['actor'] = $item['owner-link'];
+		}
 
 		$data['published'] = DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM);
 
diff --git a/src/Worker/Notifier.php b/src/Worker/Notifier.php
index 4c78d3c6ad..baae33f7e0 100644
--- a/src/Worker/Notifier.php
+++ b/src/Worker/Notifier.php
@@ -154,7 +154,7 @@ class Notifier
 			$parent = $items[0];
 
 			if (!self::isRemovalActivity($cmd, $owner, Protocol::ACTIVITYPUB)) {
-				$delivery_queue_count += self::activityPubDelivery($cmd, $target_item, $parent, $a->queue['priority'], $a->queue['created']);
+				$delivery_queue_count += self::activityPubDelivery($cmd, $target_item, $parent, $a->queue['priority'], $a->queue['created'], $owner);
 			}
 
 			$fields = ['network', 'author-id', 'owner-id'];
@@ -207,13 +207,13 @@ class Notifier
 			}
 
 			// Special treatment for forum posts
-			if (self::isForumPost($target_item, $owner)) {
+			if (Item::isForumPost($target_item, $owner)) {
 				$relay_to_owner = true;
 				$direct_forum_delivery = true;
 			}
 
 			// Avoid that comments in a forum thread are sent to OStatus
-			if (self::isForumPost($parent, $owner)) {
+			if (Item::isForumPost($parent, $owner)) {
 				$direct_forum_delivery = true;
 			}
 
@@ -413,7 +413,7 @@ class Notifier
 
 				// Add the relay to the list, avoid duplicates.
 				// Don't send community posts to the relay. Forum posts via the Diaspora protocol are looking ugly.
-				if (!$followup && !self::isForumPost($target_item, $owner)) {
+				if (!$followup && !Item::isForumPost($target_item, $owner)) {
 					$relay_list = Diaspora::relayList($target_id, $relay_list);
 				}
 			}
@@ -598,7 +598,7 @@ class Notifier
 	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 * @throws \ImagickException
 	 */
-	private static function activityPubDelivery($cmd, array $target_item, array $parent, $priority, $created)
+	private static function activityPubDelivery($cmd, array $target_item, array $parent, $priority, $created, $owner)
 	{
 		$inboxes = [];
 
@@ -607,6 +607,9 @@ class Notifier
 		if ($target_item['origin']) {
 			$inboxes = ActivityPub\Transmitter::fetchTargetInboxes($target_item, $uid);
 			Logger::log('Origin item ' . $target_item['id'] . ' with URL ' . $target_item['uri'] . ' will be distributed.', Logger::DEBUG);
+		} elseif (Item::isForumPost($target_item, $owner)) {
+			$inboxes = ActivityPub\Transmitter::fetchTargetInboxes($target_item, $uid, false, 0, true);
+			Logger::log('Forum item ' . $target_item['id'] . ' with URL ' . $target_item['uri'] . ' will be distributed.', Logger::DEBUG);
 		} elseif (!DBA::exists('conversation', ['item-uri' => $target_item['uri'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB])) {
 			Logger::log('Remote item ' . $target_item['id'] . ' with URL ' . $target_item['uri'] . ' is no AP post. It will not be distributed.', Logger::DEBUG);
 			return 0;
@@ -634,29 +637,4 @@ class Notifier
 
 		return count($inboxes);
 	}
-
-	private static function isForumPost(array $item, array $owner)
-	{
-		if (($item['author-id'] == $item['owner-id']) ||
-			($owner['id'] == $item['contact-id']) ||
-			($item['uri'] != $item['parent-uri'])) {
-			return false;
-		}
-
-		return self::isForum($item['contact-id']);
-	}
-
-	private static function isForum($contactid)
-	{
-		$fields = ['forum', 'prv'];
-		$condition = ['id' => $contactid];
-		$contact = DBA::selectFirst('contact', $fields, $condition);
-		if (!DBA::isResult($contact)) {
-			// Should never happen
-			return false;
-		}
-
-		// Is it a forum?
-		return ($contact['forum'] || $contact['prv']);
-	}
 }