Todd A. Jacobs schrieb:
> After about three months of trying to get secureserver.net to fix their
> highly-broken systems, I'd like to block all emails destined to all
> virtual domains hosted by them. However, I'm not quite sure how to do
> this with my setup.
> 
> I'm using postfix as a smarthost to forward mail through my upstream
> ISP. Is there any way to have postfix resolve the MX record of the
> destination domain and block outgoing mail on that basis?
> 

a small temp workaround is setting up an error transport for domain you
know like
in i.e /etc/postfix/transport
broken.domain error:broken.domain i dont deliver to broken.domain

better may

check_recipient_mx_access type:table
    Search the specified access(5) database for the MX hosts for the
RCPT TO domain, and execute the corresponding action. Note: a result of
"OK" is not allowed for safety reasons. Instead, use DUNNO in order to
exclude specific hosts from blacklists. This feature is available in
Postfix 2.1 and later.

or combinations of both


-- 
Best Regards

MfG Robert Schetterer

Germany/Munich/Bavaria

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