The problem of backscatter part 10 - Use SPFhttp://blogs.msdn.com/tzink/archive/2008/07/14/the-problem-of-backscatter-part-10-use-spf.aspxUsing content analysis is one trick you can use to stop backscatter.&#160; Another is to use SPF records. SPF records are designed to help combat backscatter on the theory that the recipient mail server will be able to figure out that your server didn'tenCommunityServer 2.1 SP1 (Build: 61025.2)Pregnant Man &raquo; The problem of backscatter part 10 - Use SPFhttp://blogs.msdn.com/tzink/archive/2008/07/14/the-problem-of-backscatter-part-10-use-spf.aspx#8732646Tue, 15 Jul 2008 08:35:48 GMT91d46819-8472-40ad-a661-2c78acb4018c:8732646Pregnant Man &raquo; The problem of backscatter part 10 - Use SPF<p>PingBack from <a rel="nofollow" target="_new" href="http://wordnew.acne-reveiw.info/?p=8691">http://wordnew.acne-reveiw.info/?p=8691</a></p> re: The problem of backscatter part 10 - Use SPFhttp://blogs.msdn.com/tzink/archive/2008/07/14/the-problem-of-backscatter-part-10-use-spf.aspx#8747392Fri, 18 Jul 2008 10:20:36 GMT91d46819-8472-40ad-a661-2c78acb4018c:8747392Frank<p>Actually you should simply reject the SPF FAIL at your border and be done with it. Figuring out what to do if that was a legit mail (no spam), e.g., forwarded to you by a third party, or if the SPF policy is simply wrong, is the problem of the sender. </p> <p>As soon as you accepted an SPF FAIL it is your problem, making the RFC 2821 dilemma painfully obvious: You can't bounce, most likely it is spam, confirmed by the FAIL. But maybe it wasn't, and then discarding a legit mail is &quot;not optimal&quot;, putting it mildly.</p>