I've tried the send test mail but i got this error popping out. I set it to send my backups in zip file to my email daily but it just doesn't work. There's no error or warning when running the job but the email just doesn't work. Any idea?
Fatal error: Class 'Swift_MailTransport' not found in /*****/********/public_html/wp-content/plugins/backwpup/inc/class-destination-email.php on line 402