Am 19.12.2011 01:46, schrieb Wietse Venema: > Reindl Harald: >>> Steve Fatula: >>>> Have not seen a discussion of this lately, I'd like to hear pros >>>> of disallowing said spoofing. It appears it's "allowed" in the >>>> SMTP "standard". So, are there reasons to not allow it? >>> >>> You mean, forbid mailing list postings (like yours), because they >>> arrive from outside, but have a sender address inside the network? >> >> sorry but they do not have! >> >> on some internal-relays maybe but this is not the place >> where spoof-protection is a topic >> >> but on your mx-side they are coming from my address and the >> received mails have an envelope @postfix.org > > For most users, "spoofing" is about email with their address in the > From: header, coming from an outside machine. The average email > user has no idea what an envelope sender is.
agreed, but then we should explain him because this is the address which is relevant in the smtp-protocol, but i think i have not to explain mr. postfix smtp :-)
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