Ralf..
> A MX lookup is performed to check if the sender domain exists; it can
> be activated using:
>
> reject_unknown_sender_domain

is what I was looking for..

Thank you ..
Charles

On 09/14/2010 08:18 AM, Ralf Hildebrandt wrote:
* CT<gro...@obsd.us>:

It was a question that came up in a discussion..

I have had issues in the past when delivering email and I did not
have PTR in place.. the email was rejected..

That's not an MX problem, but a missing PTR. Postfix can check for
this using:

reject_unknown_reverse_client_hostname
oder (more harsh)
reject_unknown_client_hostname

so the question regarding "inbound MX lookups" came up so I figured I
would ask..

A MX lookup is performed to check if the sender domain exists; it can
be activated using:

reject_unknown_sender_domain


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