diff --git a/src/Protocol/ActivityPub/Transmitter.php b/src/Protocol/ActivityPub/Transmitter.php
index a06fbdcf19..0d024d26fc 100644
--- a/src/Protocol/ActivityPub/Transmitter.php
+++ b/src/Protocol/ActivityPub/Transmitter.php
@@ -395,16 +395,24 @@ class Transmitter
 			foreach ($terms as $term) {
 				$cid = Contact::getIdForURL($term['url'], $item['uid']);
 				if (!empty($cid) && in_array($cid, $receiver_list)) {
-					$contact = DBA::selectFirst('contact', ['url'], ['id' => $cid, 'network' => $networks]);
-					if (DBA::isResult($contact) && !empty($profile = APContact::getByURL($contact['url'], false))) {
+					$contact = DBA::selectFirst('contact', ['url', 'network', 'protocol'], ['id' => $cid]);
+					if (!DBA::isResult($contact) || (!in_array($contact['network'], $networks) && ($contact['protocol'] != Protocol::ACTIVITYPUB))) {
+						continue;
+					}
+
+					if (!empty($profile = APContact::getByURL($contact['url'], false))) {
 						$data['to'][] = $profile['url'];
 					}
 				}
 			}
 
 			foreach ($receiver_list as $receiver) {
-				$contact = DBA::selectFirst('contact', ['url', 'hidden'], ['id' => $receiver, 'network' => $networks]);
-				if (DBA::isResult($contact) && !empty($profile = APContact::getByURL($contact['url'], false))) {
+				$contact = DBA::selectFirst('contact', ['url', 'hidden', 'network', 'protocol'], ['id' => $receiver]);
+				if (!DBA::isResult($contact) || (!in_array($contact['network'], $networks) && ($contact['protocol'] != Protocol::ACTIVITYPUB))) {
+					continue;
+				}
+
+				if (!empty($profile = APContact::getByURL($contact['url'], false))) {
 					if ($contact['hidden'] || $always_bcc) {
 						$data['bcc'][] = $profile['url'];
 					} else {
@@ -530,14 +538,18 @@ class Transmitter
 			$networks = [Protocol::ACTIVITYPUB, Protocol::OSTATUS];
 		}
 
-		$condition = ['uid' => $uid, 'network' => $networks, 'archive' => false, 'pending' => false];
+		$condition = ['uid' => $uid, 'archive' => false, 'pending' => false];
 
 		if (!empty($uid)) {
 			$condition['rel'] = [Contact::FOLLOWER, Contact::FRIEND];
 		}
 
-		$contacts = DBA::select('contact', ['url'], $condition);
+		$contacts = DBA::select('contact', ['url', 'network', 'protocol'], $condition);
 		while ($contact = DBA::fetch($contacts)) {
+			if (!in_array($contact['network'], $networks) && ($contact['protocol'] != Protocol::ACTIVITYPUB)) {
+				continue;
+			}
+
 			if (Network::isUrlBlocked($contact['url'])) {
 				continue;
 			}
diff --git a/src/Protocol/Diaspora.php b/src/Protocol/Diaspora.php
index e7857cf8e1..41ed7e7d9f 100644
--- a/src/Protocol/Diaspora.php
+++ b/src/Protocol/Diaspora.php
@@ -212,7 +212,7 @@ class Diaspora
 	 */
 	public static function participantsForThread($thread, array $contacts)
 	{
-		$r = DBA::p("SELECT `contact`.`batch`, `contact`.`id`, `contact`.`name`, `contact`.`network`,
+		$r = DBA::p("SELECT `contact`.`batch`, `contact`.`id`, `contact`.`name`, `contact`.`network`, `contact`.`protocol`,
 				`fcontact`.`batch` AS `fbatch`, `fcontact`.`network` AS `fnetwork` FROM `participation`
 				INNER JOIN `contact` ON `contact`.`id` = `participation`.`cid`
 				INNER JOIN `fcontact` ON `fcontact`.`id` = `participation`.`fid`
@@ -224,6 +224,10 @@ class Diaspora
 			}
 			unset($contact['fnetwork']);
 
+			if (empty($contact['protocol'])) {
+				$contact['protocol'] = $contact['network'];
+			}
+
 			if (empty($contact['batch']) && !empty($contact['fbatch'])) {
 				$contact['batch'] = $contact['fbatch'];
 			}
diff --git a/src/Worker/Notifier.php b/src/Worker/Notifier.php
index dac3346f95..1ce4ff244e 100644
--- a/src/Worker/Notifier.php
+++ b/src/Worker/Notifier.php
@@ -89,7 +89,7 @@ class Notifier
 			$uid = $target_id;
 
 			$condition = ['uid' => $target_id, 'self' => false, 'network' => [Protocol::DFRN, Protocol::DIASPORA]];
-			$delivery_contacts_stmt = DBA::select('contact', ['id', 'url', 'network', 'batch'], $condition);
+			$delivery_contacts_stmt = DBA::select('contact', ['id', 'url', 'network', 'protocol', 'batch'], $condition);
 		} else {
 			// find ancestors
 			$condition = ['id' => $target_id, 'visible' => true, 'moderated' => false];
@@ -374,7 +374,7 @@ class Notifier
 			if (!empty($networks)) {
 				$condition['network'] = $networks;
 			}
-			$delivery_contacts_stmt = DBA::select('contact', ['id', 'url', 'network', 'batch'], $condition);
+			$delivery_contacts_stmt = DBA::select('contact', ['id', 'url', 'network', 'protocol', 'batch'], $condition);
 		}
 
 		$conversants = [];
@@ -388,10 +388,11 @@ class Notifier
 
 				$relay_list_stmt = DBA::p(
 					"SELECT
-       					`batch`,
-       					ANY_VALUE(`id`) AS `id`,
-       					ANY_VALUE(`name`) AS `name`,
-       					ANY_VALUE(`network`) AS `network`
+						`batch`,
+						ANY_VALUE(`id`) AS `id`,
+						ANY_VALUE(`name`) AS `name`,
+						ANY_VALUE(`network`) AS `network`,
+						ANY_VALUE(`protocol`) AS `protocol`
 					FROM `contact`
 					WHERE `network` = ?
 					AND `batch` != ''
@@ -421,7 +422,7 @@ class Notifier
 			$condition = ['network' => Protocol::DFRN, 'uid' => $owner['uid'], 'blocked' => false,
 				'pending' => false, 'archive' => false, 'rel' => [Contact::FOLLOWER, Contact::FRIEND]];
 
-			$r2 = DBA::toArray(DBA::select('contact', ['id', 'url', 'name', 'network'], $condition));
+			$r2 = DBA::toArray(DBA::select('contact', ['id', 'url', 'name', 'network', 'protocol'], $condition));
 
 			$r = array_merge($r2, $relay_list);
 
@@ -432,6 +433,12 @@ class Notifier
 						continue;
 					}
 
+					if (($rr['network'] == Protocol::DFRN) && ($rr['protocol'] == Protocol::ACTIVITYPUB) &&
+						!in_array($cmd, [Delivery::MAIL, Delivery::SUGGESTION, Delivery::REMOVAL, Delivery::RELOCATION])) {
+						Logger::info('Contact is Friendica AP, so skipping delivery via legacy DFRN', ['url' => $rr['url']]);
+						continue;
+					}
+
 					if (Config::get('debug', 'total_ap_delivery') && !empty($rr['url']) && ($rr['network'] == Protocol::DFRN) && !empty(APContact::getByURL($rr['url'], false))) {
 						Logger::log('Skipping contact ' . $rr['url'] . ' since it will be delivered via AP', Logger::DEBUG);
 						continue;
@@ -466,6 +473,12 @@ class Notifier
 				continue;
 			}
 
+			if (($contact['network'] == Protocol::DFRN) && ($contact['protocol'] == Protocol::ACTIVITYPUB) &&
+				!in_array($cmd, [Delivery::MAIL, Delivery::SUGGESTION, Delivery::REMOVAL, Delivery::RELOCATION])) {
+				Logger::info('Contact is Friendica AP, so skipping delivery via legacy DFRN', ['url' => $contact['url']]);
+				continue;
+			}
+
 			if (Config::get('debug', 'total_ap_delivery') && ($contact['network'] == Protocol::DFRN) && !empty(APContact::getByURL($contact['url'], false))) {
 				Logger::log('Skipping contact ' . $contact['url'] . ' since it will be delivered via AP', Logger::DEBUG);
 				continue;