SMTP Authentication

Zend_Mail supports the use of SMTP authentication, which can be enabled be passing the 'auth' parameter to the configuration array in the Zend_Mail_Transport_Smtp constructor. The available built-in authentication methods are PLAIN, LOGIN and CRAM-MD5 which all expect a 'username' and 'password' value in the configuration array.

Example #1 Enabling authentication within Zend_Mail_Transport_Smtp

$config = array('auth' => 'login',
                'username' => 'myusername',
                'password' => 'password');
 
$transport = new Zend_Mail_Transport_Smtp('mail.server.com', $config);
 
$mail = new Zend_Mail();
$mail->setBodyText('This is the text of the mail.');
$mail->setFrom('sender@test.com', 'Some Sender');
$mail->addTo('recipient@test.com', 'Some Recipient');
$mail->setSubject('TestSubject');
$mail->send($transport);

Note: Authentication types
The authentication type is case-insensitive but has no punctuation. E.g. to use CRAM-MD5 you would pass 'auth' => 'crammd5' in the Zend_Mail_Transport_Smtp constructor.