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Re: converting from qpopper

From: Sergey Poznyakoff
Subject: Re: converting from qpopper
Date: Tue, 13 Nov 2001 12:03:15 +0200

Quoting Sam Roberts <address@hidden>, who wrote:
> How do MTAs usually deliver mail to the local spool on reception via
> smtp?
> So, what about real life? What really happens? Don't they have some
> kind of way of dealing with a locked spool?

If I remember right, both mail.local and procmail try to create and
lock a mailbox lock file (usually <spooldir>/<username>.lock), the
same way mailbox/locker.c does. Mail.local additionally applies an
advisory lock to the mailbox itself (via fcntl). If they cannot
acquire the lockfile within a predefined interval, they issue
temporary failure diagnostics. In this case the MTA puts the message
on queue, and reattempts its delivery later, exactly as you have said.

I don't know about other MDA's, though.


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