Tracing down an issue of "why are we no longer receiving owner notices"
such as list membership changes, moderation list items, etc. we are
seeing errors in MS365 side of things about "failing to deliver".
Upon deeper trackdown of this, our owner user [email protected] is
seeing messages sent to it from @lists.example.com and
@distro.example.com from [email protected] (despite the From in the
envelope being list-bounces+mailman=example.com@[lists|distro].example.com)
Is there any specific reason for this? Is it because the MS365 side is
ignoring the Envelope's From address and relying on the actual *from*
field which is breaking things because MS365 users are "not allowed to
send as [lists|distro].example.com"? This seems highly suspicious if
this is the case, and I want to see if there's anything we can do on the
Mailman side of things to make this 'work' for the 365 recipient
([email protected] is a shared mailbox for the IT team in this case,
so it's a legitimate user).
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