From: Wietse Venema (wietseporcupine.org)
Date: Mon Oct 15 2007 - 06:52:45 CDT

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infolistas listas:
> Hi users, I'm having hte following problem, my postfix is holding all
> mail-daemon messages in queue any ideia how I could solve this?

The most likely explanation: you're a backscatter source.
- Your Postfix accepts mail for users that don't exist.
- Postfix then tries to send the mail back to to the senders
  which are also bogus. The queue is filled with outgoing mailer-daemon
  messages.

Less likely explanation: you're a backscatter victim.
- Someone has been sending spam with sender addresses in your domain.
- Remote mail servers accepted mail for users that don't exist and
  are now trying to send it back to your server. The queue is filled
  with incoming mailer-daemon messages.

Which is it?

        Wietse

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