On Fri, Feb 14, 2025 at 06:13:51PM +0000, Matt Selsky via Postfix-users wrote:
> > Email with:
> > From: "whatever" <f...@example.com>, <b...@example.org>
>
> Exchange rejects this.
But it is valid RFC5322 syntax.
https://datatracker.ietf.org/doc/html/rfc5322#section-3.4
mailbox-list = (mailbox *("," mailbox)) / obs-mbox-list
https://datatracker.ietf.org/doc/html/rfc5322#section-3.6.2
from = "From:" mailbox-list CRLF
Only Sender is required to be single-valued:
sender = "Sender:" mailbox CRLF
So it is unclear that such rejection should be on unconditionally, or
even by default.
--
Viktor.
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