On 2011-11-17 3:05 PM, d...@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 127.0.0.0/8 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 127.0.0.1 as a lower
priority MX.
-Ben
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