diff --git a/api/src/Mailer.php b/api/src/Mailer.php
index e6d3f8c1666..6e0de3e49ce 100644
--- a/api/src/Mailer.php
+++ b/api/src/Mailer.php
@@ -17,6 +17,7 @@
 use Horde_Mail_Rfc822_List;
 use Horde_Mail_Exception;
 use Horde_Mail_Transport;
+use Horde_Mail_Transport_Sendmail;
 use Horde_Mail_Transport_Null;
 use Horde_Mime_Headers_MessageId;
 use Horde_Text_Flowed;
@@ -503,6 +504,13 @@ function send(Horde_Mail_Transport $transport=null, $resend=true, $flowed=null)
 	{
 		unset($resend);	// parameter is not used, but required by function signature
 
+		if ($transport === null &&
+			isset($GLOBALS['egw_info']['server']['sendmail']) &&
+			$GLOBALS['egw_info']['server']['sendmail'])
+		{
+			$transport = new Horde_Mail_Transport_Sendmail();
+		}
+
 		if (!($message_id = $this->getHeader('Message-ID')) &&
 			class_exists('Horde_Mime_Headers_MessageId'))	// since 2.5.0
 		{