I've got an email queue in a MySQL database, and via cron I process X unsent emails per minute. The problem I have is that if any specific email fails, it stops execution of the rest of the emails. In one case it was because of an SMTP authentication failure, and email processing basically came to a halt because the attempt to send the failing email kept happening. Are there other ways swiftmailer can fail that I should know about?
I'm wondering what I can do here to make this loop bulletproof? If any single email fails, I'd like to mark the record in the database with an error code (mine or swiftmailers).
Swiftmailer isn't the only way we send email, and the following method is part of a driver. What are some solutions?
public function process_queue()
{
$result = [... a few mail queue records ...];
foreach( $result as $params )
{
if( ! class_exists( 'Swift', FALSE ) )
{
require '/libraries/Mail/swiftmailer/lib/swift_required.php';
}
// Prepare transport for sending mail through SMTP
if( $params['protocol'] == 'smtp' )
{
$transport = Swift_SmtpTransport::newInstance( $params['smtp_host'], $params['smtp_port'] )
->setUsername( $params['smtp_user'] )
->setPassword( $params['smtp_pass'] );
}
// Prepare transport for simple mail sending
else
{
$transport = Swift_MailTransport::newInstance();
}
// Prepare swiftmailer mailer object
$mailer = Swift_Mailer::newInstance( $transport );
// Get a new message instance, and apply its attributes
$message = Swift_Message::newInstance()
->setSubject( $params['subject'] )
->setFrom( [ $params['from_email'] => $params['from_name'] ] )
->setTo( $params['to'] )
->setBody( $params['body'], $params['mailtype'] );
$mailer->send( $message );
}
}