Bill B. wrote:
> Is it possible to reject if the sender domain's MX record equals an illegal
> value?  Such as domains that have an MX hostname of "localhost" or an MX
> hostname which resolves to a bogus IP.
> 
> For example check out the MX for "4md401.com".  Its MX hostname is
> mail.4md401.com, which resolves to 127.0.0.1
> 
> I've seen similar cases where the MX resolves to 0.0.0.0 or a private IP.
> I've also seen where there is no MX record but the domain's A record
> resolves to a bogus IP.  I'd like to be able to block all of these.  Is it
> possible?

See http://archives.neohapsis.com/archives/postfix/2003-09/1901.html

ISTR this made it into a future snapshot so you may want to check the 
release notes to see.

-- 
Chris Scott
Host Orlando, Inc
http://www.hostorlando.com/


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