Le 23/11/2020 à 20:16, @lbutlr a écrit : > On 23 Nov 2020, at 06:49, maciejm <na...@mandzur.pl> wrote: >> "RFC 822 Message-ID is not required" > RFC 822 has been obsoleted several times. > > RFC 5322 states: > > Though listed as optional in the table in section 3.6, every message > SHOULD have a "Message-ID:" field. Furthermore, reply messages > SHOULD have "In-Reply-To:" and "References:" fields as appropriate > and as described below. > > And: > > RFC 2119 > SHOULD This word, or the adjective "RECOMMENDED", mean that there > may exist valid reasons in particular circumstances to ignore a > particular item, but the full implications must be understood and > carefully weighed before choosing a different course. > > So SHOULD is much stronger than "it's a good idea" and much more like "You > better have a really good reason for ignoring this". > > I would feel comfortable rejecting messages without a Message-ID. >
Maybe on smtp, but not on submission. FOr me policy there is completeley different
