diff --git a/lib/Alchemy/Phrasea/Notification/Deliverer.php b/lib/Alchemy/Phrasea/Notification/Deliverer.php
index 6c7ef99b21..77b2661ab7 100644
--- a/lib/Alchemy/Phrasea/Notification/Deliverer.php
+++ b/lib/Alchemy/Phrasea/Notification/Deliverer.php
@@ -76,7 +76,11 @@ class Deliverer
             $message->setReadReceiptTo([$mail->getEmitter()->getEmail() => $mail->getEmitter()->getName()]);
         }
 
+        if(!$this->mailer->getTransport()->isStarted()) {
+            $this->mailer->getTransport()->start();
+        }
         $ret = $this->mailer->send($message);
+        $this->mailer->getTransport()->stop();
 
         $this->dispatcher->dispatch('phraseanet.notification.sent');
 
diff --git a/tests/Alchemy/Tests/Phrasea/Notification/DelivererTest.php b/tests/Alchemy/Tests/Phrasea/Notification/DelivererTest.php
index 6ae92610ba..ae396fae4a 100644
--- a/tests/Alchemy/Tests/Phrasea/Notification/DelivererTest.php
+++ b/tests/Alchemy/Tests/Phrasea/Notification/DelivererTest.php
@@ -337,7 +337,20 @@ class DelivererTest extends \PhraseanetTestCase
 
     private function getMailerMock()
     {
-        return $this->getMockBuilder('\Swift_Mailer')->disableOriginalConstructor()->getMock();
+        $mailer = $this->getMockBuilder('\Swift_Mailer')
+            ->disableOriginalConstructor()
+            ->getMock();
+
+        $transport = $this->getMock('Swift_Transport');
+        $transport->expects($this->any())
+            ->method('isStarted')
+            ->willReturn(true);
+
+        $mailer->expects($this->any())
+            ->method('getTransport')
+            ->willReturn($transport);
+
+        return $mailer;
     }
 
     private function getEmitterMock()