My Mailtraq server got hit by a POP3 dictionary attack this morning. 41,903 connection attempts in 12 minutes, and all but the first 10 were denied after MTQ determined it was being attacked. End result: one huge log file, one phone call to the IT department of a certain Canadian institute of higher education, but most importantly, one completely unperturbed mail server. :)
Thank you for the positive feedback. It is very nice to see Mailtraq correctly handling a situation that is quite hard to simulate.