diff --git a/src/Symfony/Component/Mailer/Transport/Smtp/Stream/AbstractStream.php b/src/Symfony/Component/Mailer/Transport/Smtp/Stream/AbstractStream.php
index a2fcb945dc..623717fcaf 100644
--- a/src/Symfony/Component/Mailer/Transport/Smtp/Stream/AbstractStream.php
+++ b/src/Symfony/Component/Mailer/Transport/Smtp/Stream/AbstractStream.php
@@ -80,6 +80,9 @@ abstract class AbstractStream
             if ($metas['timed_out']) {
                 throw new TransportException(sprintf('Connection to "%s" timed out.', $this->getReadConnectionDescription()));
             }
+            if ($metas['eof']) {
+                throw new TransportException(sprintf('Connection to "%s" has been closed unexpectedly.', $this->getReadConnectionDescription()));
+            }
         }
 
         $this->debug .= sprintf('< %s', $line);