[Mimedefang] Only MX record is fake
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 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.
More information about the MIMEDefang