On 2025-03-28 at 11:32:50 UTC-0400 (Fri, 28 Mar 2025 16:32:50 +0100)
Marco Moock via mailop <m...@dorfdsl.de>
is rumored to have said:
Hello!
When trying to deliver DMARC reports to <dm...@u64.de>, I get
----- The following addresses had permanent fatal errors -----
<dm...@u64.de>
(reason: 550 This address does not send an unsigned return path.)
What does this message mean?
SMTP MAIL FROM is from=<postmas...@dorfdsl.de
Return-Path: <postmas...@dorfdsl.de>
FWIW, those two are usually tightly bound: the Return-Path header does
not normally exist until it gets created when the message is delivered
*out* of SMTP (e.g. to a mailbox.) What can be be varied is the "From:"
*header* address.
Most likely they have implemented BATV to reject bogus bounces. BATV
assures that all mail with a "From" header of postmas...@dorfdsl.de will
have a SMTP sender address with a keyed modification of the "real"
address.
--
Bill Cole
b...@scconsult.com or billc...@apache.org
(AKA @grumpybozo@toad.social and many *@billmail.scconsult.com
addresses)
Not Currently Available For Hire
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