On Tue, 2004-09-28 at 20:00, David F. Skoll wrote: > I defy anyone to show me an RFC that says an SMTP implementation > MUST accept mail from <> to <[EMAIL PROTECTED]>
From my e-mails to the admin of rfc-ignorant.org, I believe the stance is that "postmaster" (case-insensitive with or without the domain) must accept mail from anyone. The basis cited for this is RFC 2821, specifically section 4.5.1: SMTP systems are expected to make every reasonable effort to accept mail directed to Postmaster from any other system on the Internet. In extreme cases --such as to contain a denial of service attack or other breach of security-- an SMTP server may block mail directed to Postmaster. However, such arrangements SHOULD be narrowly tailored so as to avoid blocking messages which are not part of such attacks. I said DSNs were the *most common* (emphasis added here so the quote below makes sense) usage of the null sender and I speculated that you (David) did not send mail from postmaster, and thus had no reason to expect DSNs for that address. I imagine you put the block in place to stop bounces from joe jobs. The rfc-ignorant.org admin said: "most common" != "only". Richard Laager
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