On Wed 26/Mar/2025 16:13:23 +0100 John Levine wrote:
It appears that Wei Chuang <wei...@google.com> said:
the "rt=" or in the RFC5322 address headers. Which of these is easier to
adopt by open source DKIM and SMTP packages? Might splitting all
recipients be a simple config already in those open source SMTP?
FWIW, in both Postfix and Exim, it's a one line config change to do individual deliveries.
qmail has always only done individual deliveries.
If you want to do VERP, Postfix and qmail have options to do the bounce address munging in
the MTA, so your mailing list sends one message with many recipients but when it goes out
on the wire it's expanded to individual copies with unique bounce addresses.
The question is how many recipients does the signing agent see. And it should
be able to distinguish which of these are Bcc:.
I continue to believe that whatever problem was solved by multiple recipients went away
decades ago. These days mail is a tiny fraction of net usage.
It's a matter of MTA design. The closer the specification adheres to SMTP, the
wider the implementation choices.
Best
Ale
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