Marc Perkel wrote:
Here's a cheap trick that I use to get rid of a lot of spam. What I do
is set my highest MX record to a nonworking IP address. Spammers often
start at the highest MX rather than the lowest figuring the highest has
less spam filtering. And the spammers never retry. IO get rid of about
120,000 spams a day with this trick.
and this will also get you blacklisted - it is not allowed to have non-working
or bogus MX records. See http://www.rfc-ignorant.org/policy-bogusmx.php
Auke
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