CakePHP: How To Have Consistent SMTP Connection

It’s necessary to configure an SMTP server that will take care of your email deliveries while setting up a mail client. The process is easy – just add the right SMTP parameters to the settings of your email software & you’re good to go.

SMTP server has a limit for number of requests in a time interval & a max limit for sending emails per connection, which varies as per different service providers.

• While creating the object of Cake Email utility, we have to pass “persistent = true”.

 $Email = new CakeEmail();
 $Email->config(array('persistent' => true));

• Change the below file for persistent connection changes.

lib\Cake\Network\Email\SmtpTransport.php
public function send(CakeEmail $email) {
    $this->_cakeEmail = $email;
 
    if(!$this->_config['persistent'] || !$this->_socket){
        $this->_connect();
        $this->_auth();
    }
    $this->_sendRcpt();
    $this->_sendData();
    if(!$this->_config['persistent']){
        $this->_disconnect();
    }
    return $this->_content;
}

• Add this function in the CakeEmail file.

lib\Cake\Network\Email\CakeEmail.php
public function disconnect() {
    $this->transportClass()->disconnect();
}
 
lib\Cake\Network\Email\SmtpTransport.php
public function disconnect(){
    $this->_disconnect();
}

• Disconnect the connection, after emails are sent.

$Email->disconnect();

Remember that using a standard SMTP (the one associated to free email providers like Yahoo, Hotmail or Gmail) doesn’t ensure delivery of all your messages, especially if you have a long list of recipients. 

Hope  this article helped configuring an SMTP connection.

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