From: Magnus Bäck (magnusdsek.lth.se)
Date: Thu May 14 2009 - 07:52:37 CDT

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On Thu, May 14, 2009 2:20 pm, Esteban Torres Rodriguez said:

> I have problem with some user. This user's sometimes receive email:
>
> A message that you send could not be delivered to one or more of its
> recipients.........
>
> And Sometimes send email correct. No problem!!!!
>
> How to control thats?

Are the bounce messages he receives a result of messages he has sent via
your server?

If so, he may be the victim of backscatter.

http://www.postfix.org/BACKSCATTER_README.html

If not, we need to see the corresponding Postfix log (or in worst case the
bounce message) and your configuration as requested in the list
introduction message.

--
Magnus Bäck
magnusdsek.lth.se

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