In symfony2.3 I am using swiftmailer.
I have a Google Apps address like myname@abc.com and my normal gmail address myname@gmail.com
When using:
When you create the message in your controller or anywhere, it's there where you put the sender (setFrom method)
// Create a message
$message = Swift_Message::newInstance('Wonderful Subject')
->setFrom(array('john@doe.com' => 'John Doe'))
->setTo(array('receiver@domain.org', 'other@domain.org' => 'A name'))
->setBody('Here is the message itself')
;
In your configuration file the mailer_user is used only for connecting to the gmail's smtp server.