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Subject:Attack your baby, she wants
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firstname.lastname@example.org on 02/12/2008 01:45
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< server.server.com #5.2.0 SMTP; 550 ######## SPAM EMAIL NOT ACCEPTED ########>
The server listed at the bottom is listed second on the list of mx records for the domain the emails seem to be coming from.
What should I do to get rid of these? Should I be worried etc.
Blah.com Only accept mail from the domain Blah.com
But we were sending our mail through our ISP, so I have just got onto the hosts to update it to:
Blah.com Only accept mail from the domain Blah.com and ISP.com
I don't think this will solve the OP problem, but it should help getting past some mail filters etc. as you say.
As stated, an SPF record can't stop them from sending the fake receipts, but your filters can more easily determine that they're illegitimate and send them straight to the dustbin.