in reply to Sending Custom Mass Mail - Fastest Way Possible

Hmmm ... by default, I believe MIME::Lite uses sendmail (or postfix?) to send messages. If you don't have sendmail on the box, it may default to SMTP and that's just going to be a disaster sooner than later. I would check to see if you've properly configured sendmail (or postfix?) to properly queue and delay send the emails.