Am 01.06.2012 02:07, schrieb Patrick Lists: > My Postfix setup works quite well blocking most spam. But I sometimes > get spam with (to my untrained eye) valid MAIL from: and RCPT to: email > addresses but in the DATA section there is a forged From: > <m...@mydomain.com>. At least that's how it works when I use telnet to > port 25 on my Postfix box. > > I tried the example header_checks [1] from the BACKSCATTER_README which > work fine except that they also block my own email. What is the proper > way to block forged From: addresses in the DATA section?
there is no proper way simply because it is legitimate that From: is not the same as the envelope sender - if you are trying to block such mails you would block many regular mails!
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