The Domain is "lstn.net" -- That domain has thousands of servers that have a way to mask everything.
Here is what is happening:
Their Domains is listed like this: 23-201-63-74.static.reverse.lstn.net
Naturally that is one of thousands as a Reverse Static?
Cyren Premium Anti-spam - Enabled
Blacklist - I blacklist one block 22.214.171.124/24 and they find another block to choose from.
SMTP Block -- EHLO Domain *.lstn.net" < Does Not Work
Enable rDNS -- and Mail from them also come in "UnknownHost [126.96.36.199])" This is done by labeling itself one domain and being a part of "lstn.net"
Weight Spam Block is set to 30 -- Theirs comes in at a wright of 50+
Content Filter Set to anywhere in Header: "*..lstn.net"
NOT ONE eMAIL EVER GOTTEN FROM THAT OUTFIT HAS BE WANTED OR SUBSCRIBED TO.
How do I beat this Nemesis!