> > hi, I just wanna ask what rule should I aply to stop mails that have in > header from=<> . > thanks for any (hope there will be some hehe) replys >
IIRC, that's a valid field.. some RFC somewhere talked about it. I forgot which one, but I've seen it pop up on the Postfix list a few times.
Yep in fact, the dsn.rfc-ignorant.org blacklist explicitly lists domains that incorrectly refuse mail that at the SMTP layer has a null envelope from.
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