Inci­den­tal­ly, I just switched to archiveopteryx (after look­ing at dove­cot) and was, well, aston­ished, at how easy it was: make install, run installer, change con­fig to for­bid plain logins and voila: a fast imap and smtp sub­mis­sion serv­er with all­most no con­fig­u­ra­tion! Since I used dbmail before, I could trans­fer users with some sim­ple sql hacking…