Fixes

src/Monolog/Handler/MailHandler.php

@@ -53,7 +53,9 @@ abstract class MailHandler extends AbstractHandler
             $messages[] = $record['message'];
         }
         
-        $this->send($this->createMessage($messages));
+        if (!empty($messages)) {
+            $this->send($this->createMessage($messages));
+        }
     }
     
     /**

src/Monolog/Handler/SwiftMailerHandler.php

@@ -11,6 +11,8 @@
 
 namespace Monolog\Handler;
 
+use Monolog\Logger;
+
 /**
  * SwiftMailerHandler uses Swift_Mailer to send the emails
  * 
@@ -26,11 +28,15 @@ class SwiftMailerHandler extends MailHandler
      * @param \Swift_Mailer $mailer The mailer to use
      * @param \Swift_Message $message An example message for real messages,
      *                                only the body will be replaced
+     * @param integer $level The minimum logging level at which this handler will be triggered
+     * @param Boolean $bubble Whether the messages that are handled can bubble up the stack or not
      */
-    public function __construct(\Swift_Mailer $mailer, \Swift_Message $message)
+    public function __construct(\Swift_Mailer $mailer, \Swift_Message $message, $level = Logger::ERROR, $bubble = false)
     {
         $this->mailer  = $mailer;
         $this->message = $message;
+        $this->level   = $level;
+        $this->bubble  = $bubble;
     }
 
     /**

tests/Monolog/Handler/MailHandlerTest.php

@@ -37,6 +37,22 @@ class MailHandlerTest extends TestCase
         $handler->handleBatch($records);
     }
     
+    public function testHandleBatchNotSendsMailIfMessagesAreBelowLevel()
+    {
+        $records = array(
+            $this->getRecord(Logger::DEBUG, 'debug message 1'),
+            $this->getRecord(Logger::DEBUG, 'debug message 2'),
+            $this->getRecord(Logger::INFO, 'information'),
+        );
+        
+        $handler = $this->getMockForAbstractClass('Monolog\\Handler\\MailHandler');
+        $handler->expects($this->never())
+            ->method('send');
+        $handler->setLevel(Logger::ERROR);
+        
+        $handler->handleBatch($records);
+    }
+    
     public function testHandle()
     {
         $record = $this->getRecord();