I am running a a Raq4 using MS 3.x. It seems to work well and is running in a production environment. I am using several blackholes in sendmail.cf to block SPAM rather then Mailscanner. I have heard a few problems upgrading to 4.x on a Raq. If everything is working ok with 3.x should I bother with 4.x? Then again will support for 3.x be dropped? Matt