Viktor Dukhovni via Postfix-users wrote in
<z6-j2wjhqckn8...@chardros.imrryr.org>:
|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.
RFC 5322 explicitly requires the use of Sender: in the presence of
a From with multiple mailboxes, which is i think the problem of
the op. (The BSD Mail clone i maintain then requires user
interaction, unless the variable *sender* is set, however
documents
sender An address that is put into the ‘Sender:’ field of outgoing
messages, quoting the standard RFC 5322: the mailbox of the
agent responsible for the actual transmission of the message.
For example, if Mary sends a mail for Alice, then Alice should
be in ‘From:’ whereas Mary should be present in ‘Sender:’. Ac‐
cording to the standard this variable must be set if from† con‐
tains multiple addresses. [v15 behaviour may differ] Expect
automatic management of the from† and sender† relationship (re‐
quiring an address order in the former). alias†es are expanded
^ that the magic RFC5322.From is expected to be sorted in the
future, so that the first entry can be used as Sender:, ie, what
is implicitly used by DKIM for that purpose...)
instantly with senders kept; Contextually this address is a
member of alternates†. Also see -r†, r-option-implicit†.
--steffen
|
|Der Kragenbaer, The moon bear,
|der holt sich munter he cheerfully and one by one
|einen nach dem anderen runter wa.ks himself off
|(By Robert Gernhardt)
|
|In Fall and Winter, feel "The Dropbear Bard"s pint(er).
|
|The banded bear
|without a care,
|Banged on himself for e'er and e'er
|
|Farewell, dear collar bear
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