Just to tell you: when I tried Pegasus one month ago, I could not receive or send mail with avast! and Spamihilator. I did a throughly test run: on and off a lot of things (applications, firewall, ports, pop and smtp server, etc...) Nothing happens... I give up - for a while - about testing Pegasus, which seems to be quite a good email client anyway, with a lot of features. Unfortunatelly, for me, not compatible with avast and Spamihilator.