On 2010-01-18 Frank Bonnet wrote:
> I wonder how to reject a particuliar address at MX machine
>
> actually I use :
> smtpd_sender_restrictions =
> \check_sender_access hash:/usr/local/etc/postfix/sender_access
>
> on the mailhub which is not "Internet visible" but I would like to reject 
> with the MX machine to avoid transmission to the mailhub.
>
> The MX does not provide local delivery, it uses transport to forward
> emails to the mailhub and several other machines.
>
> is it possible ?
> if yes with which instruction ?

http://www.postfix.org/postconf.5.html#relay_recipient_maps

If your MX is configured to forward all mail for your domain(s) to the
mailhub, and it's left to the mailhub to check if a particular address
is valid, you'll be generating backscatter. Don't do that.

Regards
Ansgar Wiechers
-- 
"Abstractions save us time working, but they don't save us time learning."
--Joel Spolsky

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