[Mailman-Users] Message-ID required - was: Reply-to options not working

[Mark Sapiro]

On 02/05/2018 12:22 AM, Stephen J. Turnbull wrote:
> 
> According to RFC, Message-ID is an originator field, and MUST be
> present and MUST be unique.

Do you have a reference for this? I thought this was correct, but I
recently looked it up in RFC 5322 and predecessors (see
<https://lists.mailman3.org/archives/list/mailman-users@mailman3.org/thread/UCH46WS4RII5HKZWGQTBUDUHZMJZDFNC/>,
and those RFCs at least say it's optional and SHOULD be present.

-- 
Mark Sapiro <mark at msapiro.net>        The highway is for gamblers,
San Francisco Bay Area, California    better use your sense - B. Dylan