Sending via SMTP

To send mail via SMTP, Zend\Mail\Transport\Smtp needs to be created and registered with Zend\Mail before the send() method is called. For all remaining Zend\Mail\Message::send() calls in the current script, the SMTP transport will then be used:

Sending E-Mail via SMTP

$tr = new Zend\Mail\Transport\Smtp('mail.example.com');
Zend\Mail\Message::setDefaultTransport($tr);

The setDefaultTransport() method and the constructor of Zend\Mail\Transport\Smtp are not expensive. These two lines can be processed at script setup time (e.g., config.inc or similar) to configure the behavior of the Zend\Mail\Message class for the rest of the script. This keeps configuration information out of the application logic - whether mail is sent via SMTP or mail(), what mail server is used, etc.