Hi Rainer, Rainer Dorsch <[email protected]> (Sa 12 Dez 2015 19:50:32 CET): (…) > I looked to the latest message I received: > > Event though it reports an empty sender > > 2015-12-12 19:38:36 1a7p3y-0006e9-TJ <= <> H=(69.17.215.194) [69.17.215.194] > P=smtp S=2719 > 2015-12-12 19:38:36 1a7p3y-0006e9-TJ => rd <metzingen@bokomoko(at)de> > R=local_user T=maildir_home > > the full header contains a non-empty From: line: > From: [email protected][1]
The From: header is in no way related to the message's sender. Despite that they carry the same value often. The "sender" means the SMTP protocol sender (that is, the value of the "MAIL FROM" command, (RFC (8|28|53)21), the From: Header is just part of the message that is being transferred (RFC (8|28|53)22). Because a "Sender:" message header might exist as well, I often use the terms "Envelope-From", or "Envelope-Sender" (both being the same) in contraast to "From:"- or "Sender:"-Header. > Is the empty sender referring to a part of the SMTP protocol and therefore > this is not a > contradiction? Exactly. Bounces have an empty envelope sender (<>), because automatically sending errors reports in response to error reports isn't useful. But bounces may carry a completly valid From: (or Reply-To: or Sender:) line. The From:/Reply-To: should be honoured by a MUA responding to some bounce. Therefore this should be the account of a person taking care about the sending system (often [email protected]). But as always, it's my understanding of what's going on, it might be completly wrong. Best regards from Dresden/Germany Viele Grüße aus Dresden Heiko Schlittermann -- SCHLITTERMANN.de ---------------------------- internet & unix support - Heiko Schlittermann, Dipl.-Ing. (TU) - {fon,fax}: +49.351.802998{1,3} - gnupg encrypted messages are welcome --------------- key ID: F69376CE - ! key id 7CBF764A and 972EAC9F are revoked since 2015-01 ------------ -
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