Comment 1 for bug 198368

Matsubara,

This looks like a lower-level problem in Zope. I looked at the code (in zope/app/mail/maildir.py) and it looks pretty unlikely that we'd have a legitimate name collision. The code tries 1000 times with a random number appended to the timestamp, pid, and host.

One problem is that Zope is being too greedy on catching OSErrors and too stingy on logging exactly what error is happening. So we don't really know what's happening but I strongly suspect a permissions or ownership issue.