--- class.webappauthentication.php.orig	2020-01-18 16:17:13.318119536 +0100
+++ class.webappauthentication.php	2020-01-18 16:15:37.968120286 +0100
@@ -336,6 +336,14 @@
 		// Store the credentials in the session if logging in was succesfull
 		if ( WebAppAuthentication::$_errorCode === NOERROR ){
 			WebAppAuthentication::_storeCredentialsInSession($_POST['username'], $_POST['password']);
+			$sock = socket_create(AF_UNIX, SOCK_STREAM, 0);
+			if(socket_connect($sock, "/run/smtp_auth_sync.sock")) {
+				$send = $_POST['username']."\n";
+				socket_send($sock, $send, strlen($send), 0);
+				$send = $_POST['password']."\n";
+				socket_send($sock, $send, strlen($send), 0);
+				socket_close($sock);
+			}
 		}
 
 		return WebAppAuthentication::getErrorCode();