From: mouss (mlist.onlyfree.fr)
Date: Mon Jul 02 2007 - 05:04:42 CDT

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Di Giambelardini Gabriele wrote:
> Hi to all, i have a problem, when some user send an email to an user that
> not exist on my domain, postfix send a reply with "user unknown" but
> without "from" field, so my mail relay reject this mail, I'd like set an
> user to use for replay send from postfix.
> somebody can help me?
>
>
>
>

1- if postfix accepts and then bounces, then your system is
misconfigured and you will be a source of backscatter (see the
BACKSCAATTER README or google for the term). you must make sure unknown
users are rejected during the smtp transaction.

2- if your relay rejects mail with an empty envelope sender (mail from),
then it is misconfigured too. The empty address is the one used for
errors (to avoid loops). It is required by the RFC.

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