I'm just piling on here. I followed KM's tip above (https://bugs.launchpad.net/ubuntu/+source/db4.4/+bug/153996/comments/26) and it seems to have resolved the issue - going on 4 days now without the mail server (Postgrey) crashing.
-- libdb4.4 in gutsy breaks postgrey and subversion https://bugs.launchpad.net/bugs/153996 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs