On 2026-07-10 13:28, Stephen J. Turnbull wrote:
As always, Mark may have better ideas.
Thomas Ward via Mailman-users writes:
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
<img src="friends-dont-let-friends.gif"/>
What is MS365 complaining about? Do you get an informative status, or is it just 5.7.0 administratively denied, or what?
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The actual problem appears to be *after* delivery. It is handed to MS365 and then MS365 says the very annoying failure message ONLY in the MS Exchange logs of "Sending from the lists.example.com domain has been blocked by your email admin."
The additional problem is that MS365 is seeing the 'sender' as the actual 'account' in MS365 and is probably complaining. What I can't tell is *why* it's hard-failing this way.
Given that the issue is intrinsic to the setup and we can't really change it (I don't want to diverge from the tree too much), I think I'll have to raise this with Microsoft to see what's going on. I may temporarily reset everything to email *me* instead temporarily, see what is actually going on. But we'll see what happens.
Thomas