[Mimedefang] Only MX record is fake

Ben Kamen bkamen at benjammin.net
Thu Nov 17 16:13:45 EST 2011

On 2011-11-17 3:05 PM, dfs at roaringpenguin.com wrote:
>> Those people checking for valid MX records for a sender's domain from
>> within MIMEdefang ... is anybody checking if a sender's one and only MX
>> record is a fake MX tempfailing service? Has anyone ever seen this type
>> of setup for legitimate e-mail?
> Our commercial product has a setting to reject mail from any domain
> that has an MX record that resolves back to or ::1.  We've
> had no false-positives reported.

A long time ago, I remember reading that having a backup MX to localhost was to send spammers spinning to themselves eventually if your server rejected them.

it was a funny read -- but not sure how usable now..

This thread reminded me of that and why someone my  have as a lower priority MX.


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