From: Wietse Venema (wietseporcupine.org)
Date: Thu Feb 01 2007 - 10:10:08 CST

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Phil Barbier:
> Hi there all,
>
> I've got a strange problem that manifested itself (seemingly from
> nowhere) after a crash/load spike and subsequent hard reset of my web
> server. The server is a FBSD6.1 box, and postfix runs alongside
> apache (1.3.xx) in a jail, all was working just fine prior to the
> reboot (at least I assume the reboot is partially responsible here).
>
> I am getting two copies of every e-mail that is set to go out. I've
> tested this with our web-based eNewsletter software, it sends two. I
> checked the software, made sure things looked OK there - the software
> is behaving properly.
>
> I then set up a fake cronjob, to test whether the cron report came
> twice. It did. (something like 00 0 * * * /path/to/nothing in the
> crontab).
>
> I telnetted to the server on port 25, sent a message using raw SMTP,
> this did NOT send two e-mails, it worked properly as expected.

Conclusion: Postfix DELIVERS one copy per message.

> I checked the source of the last test I did, both messages have more
> or less identical headers, except the message-ID is unique, which
> leads me to think they're being spooled twice by accident.

Conclusion: Postfix RECEIVES multiple copies.

> To be sure, I cleared the queue (postsuper -d ALL to get rid of some
> older crap from a previous mailer) and restarted the postfix service
> between doing different tests, to ensure I hadn't just got some
> whacked out postmaster process. This didn't change anything.
>
> I don't know enough about Postfix to troubleshoot this further, and
> would obviously like to fix this issue ASAP, does anyone have any
> ideas/thoughts/comments/questions on this one?

You have already demonstrated that Postfix RECEIVES multiple copies
of mail. Postfix is doing its job.

Stop shooting the messenger and find out what is giving Postfix
the multiple copies.

        Wietse

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