Comment 3 for bug 265869

I can confirm this on OpenBSD 3.3 running Mailman 2.1.3 and
Postfix 2.0.16. I get the same exact error. Perhaps I should
try reinstalling without following the setgid flag for BSD.

Just for confirmation, after each email is sent with an
attachment, check_perms reports it doesn't have 02775
permissions. After check_perms -f is run and another email
sent, the same thing occurs, but for a different directory.
Commenting out the offending lines seems to have fixed the
problem; even the archive is correct.

I'll try recompiling in a day or two after I get some sleep.