SixXS easynet pop regained life yesterday. Unfortunately my fetchmail daemon could not be persuaded to talk to our imap server over ipv6 again. Turns out, that the ipv6 implementation in fetchmail is flawed because it only works, if the dns name of your server has an a record in addition to the aaaa record. This behavior has been documented two years ago with some proposed fixes but it looks like no one had the interest to implement them.