http://www.openspf.org/
This is supported by Exchange 2003+ with GFI's freeware addition.
http://www.msexchange.org/
Also look at SenderID
http://www.msexchange.org/
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Question
How do I block Spam sent from myself??
I have a number of customers and now myself all with spam protection in place recieving spam that appears to be from the sender. I.E Im sending myself the spam.
Because of this it appears to be skipping right by any spam protection. IS there a way to stop this in exchange 2003 and 2007?
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Answers
The Sender Policy Framework (SPF) information skiddy89 provided looks really great! Nearly brilliant and long overdue!
This is not something the client / end user can implement unless they happen to be administering a mail server also, but it can be passed along to the Internet Service Provider (ISP) and encouraged! The more people that read this page, the more rapidly it will be adopted and (possibly) bring "clean" e-mail back to the masses.
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by: Klaatu01Posted on 2009-01-07 at 07:15:35ID: 23315446
Until such time as e-mail begins using Certificates and Senders or Recipients must be implicitly "trusted" there will be no way to differentiate legitimate replies from "spoofed" replies.
You would need a way to authenticate the identity of every incoming message before passing it along to the recipient's mailbox, and this is being done with Filtering but is still not discriminating to catch "good fakes".
"How to configure Internet e-mail accounts in Outlook"
http://support.microsoft.c
"Certificate based email" may be coming as shown in this 1 of 8 "hits" example in Google, but the provider is in th United Kingdom and the document does not go into any explicit detail. It may even be there is some confusion over the terminology and what they are offering is not what it appears to be (to me) at first glance.
http://www.tmcsms.com/docs