Spawns a little SMTP server that will redirect all mail relayed through it to you.

smtptome.py

import asyncore
import smtpd

MY_ADDRESS = 'user@example.com'

class RedirectingProxy(smtpd.PureProxy):
    def _deliver(self, mailfrom, rcpttos, data):
        smtpd.PureProxy._deliver(self, mailfrom, [MY_ADDRESS], data)

if __name__ == '__main__':
    proxy = RedirectingProxy(('localhost', 2525), ('localhost', 25))
    asyncore.loop()