Hi again, sorry for the noise: the segmentation faults were due to a memory module dying on this machine, and rebooting without it made them disappear. i didn't managed to reproduce the attachment problem, but i still see these ones:
WARNING: UID validity problem for folder INBOX.some.maildir (saved 1134376443; got 1138204521); skipping it thanks, piem -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]

