Ben - I use office365 for my personal email (gmail for public mailing
lists). I agree with you on gmail and how it works with LISTSERV lists
- but my personal email hosted on 365 / Exchange Online doesn't show
this behaviour.

I run a Lite / free edition server (on a different domain) and I can
send email to a list, have it distributed and a copy back in my
mailbox (filtered into the right folder by Outlook) in the usual way.
Exchange isn't tracking the message-ID in the way that Gmail does.

Happy to create a test list and send logs/examples if you want.  Maybe
Lite / free edition does things differently?


On 13 September 2014 23:01, Ben Parker <[log in to unmask]> wrote:
> On Fri, 12 Sep 2014 18:23:53 +0000, F J Kelley <[log in to unmask]> wrote:
>
>>The message never showed up (she is a subscriber, with REPRO on, she would receive a copy of her post).
>
> MS Exchange (in-house installations) and gmail.com store emails in a
> database.  Both use the RFC822 field "message-ID" as a primary key to
> prevent duplicates.  So, gmail users often complain they also never receive
> copies of posts they originate.  Slightly less often we get the same
> complaint from Outlook/Exchange users.
>
> LISTSERV is not at fault here.  Thru close examination of the various
> appropriate log files, it is possible to prove that LISTSERV did indeed send
> out the specific email to that person who originated it.  However once they
> receive it, the message-ID causes the received email to be discarded as-if
> never received.
>
> I don't know about Office 365 but I have no reason to suppose this behaves
> any differently from an in-house instance of Exchange.  In all such cases
> the recommended solution is for the user in question to turn off REPRO
> setting in LISTSERV and turn on ACK.
>
> Then instead of sending a copy of the original message back to the user
> (with the message-ID field intact and unchanged and thus subject to being
> discarded), LISTSERV creates and sends out a message with text like "your
> message of (date) and subject (subject) has been distributed to the XYZ list
> (xxx recipients)."  Since this messaage is created by LISTSERV it has a
> different message-ID not matching anything the user created previous so is
> readily accepted.
>
> Frankly I wonder why this topic comes up so often?  Do people not trust
> LISTSERV will distribute their message?  Is the only acceptable proof of
> sending to get back a copy your own message?  I get too much email already
> and I want neither a REPRO copy or an ACK either or both of which I would
> simply have to delete.
>
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