BeatBomber

BeatBomber is a neato spam program that runs directly from your machine. No SMTP server necessary. Just make a Gmail account behind a proxy, plug this into Prox/i/fier and test it out on yourself with a few messages. Allow ~5 minutes. If it works then spam your enemy.

Where I are get this

In the /i/Kit.

Gmail Security

This program is of questionable value as Gmail accounts now require a valid phone number to be created, so that they can send you the verification code. Because of this to use this program you need to either have pre-existing Gmail accounts that you don't mind getting deleted or to make trips to a pay-phone whenever you want a new account that doesn't link straight back to you. Try Sparky's Mailbomber instead.

lol screenshot