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12 Feb 2022, 02:00 AM | #16 |
Intergalactic Postmaster
Join Date: May 2004
Location: Irving, Texas
Posts: 8,929
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I’m sure that in this case, the Yahoo delivery server kept a copy of the message and also forwarded a copy to a Gmail address. See the Yahoo premium account setup (forwarding was discontinued from free Yahoo accounts on January 15, 2021, but is still available for premium accounts):
https://help.yahoo.com/kb/SLN29133.html So one copy of the will remain in the Yahoo user Inbox, while an attempt was made to forward a copy to the Gmail account.
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12 Feb 2022, 02:21 AM | #17 | |
The "e" in e-mail
Join Date: Oct 2002
Location: Holon, Israel.
Posts: 4,856
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Quote:
I tested this by sending myself a message with different "From" header and envelope from (using the "Send a copy" function in Fastmail) and the address in the Return-path wasn't the address in the From header but rather my Fastmail userid (surprising and disappointing: I am quite sure that in the past the default identity address was used there, and I never want my userid to appear anywhere but in the login screen). |
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12 Feb 2022, 08:50 AM | #18 | |
Intergalactic Postmaster
Join Date: May 2004
Location: Irving, Texas
Posts: 8,929
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Quote:
You can read all about this in section 4.4 (Trace Information) of RFC 5321 at: https://datatracker.ietf.org/doc/htm...21#section-4.4 When auto forwarding, the system doing the forwarding (Yahoo in the example by the original poster in this thread) adds a Return-path header at the top, then uses that Return-path address as the new envelope FROM during the forwarding SMTP session. The new final forwarded destination server then uses the envelope FROM (which is the same as the Return-path header at the previous step, so comes from the original message originating system) to generate the error message. This is all far too arcane for regular email users! The bottom line is that in nearly all cases, the From address used when you create an original email message is where any delivery error messages are sent. Bill |
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