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

Dimitri Maziuk dmaziuk at bmrb.wisc.edu
Mon Feb 5 13:19:58 EST 2018

On 02/05/2018 11:55 AM, Mark Sapiro wrote:
> 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.

Heh. I personally believe that a message sent by a mailing list *must*
have the mailing list as the originator: dkim, id, and whatever else.
And then there *should* be a way to reply "off list". Of course then you
have to preserve the original originator all the way to the beginning, so...

And even if "Message-ID MUST be present and MUST be unique", that
doesn't make the converse true: that two copies of the same message
*must* carry the same Message-ID.

Dimitri Maziuk
BioMagResBank, UW-Madison -- http://www.bmrb.wisc.edu

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