When did that happen? 
----- The following addresses had permanent fatal errors -----
pool@lists.ntp.org
(reason: 550 5.1.1 pool@lists.ntp.org: Recipient address rejected: User unknown in local recipient table)
Just a wild guess, ntp.org, but perhaps when this forum was set up? Or just before, prompting this forum’s creation.
I don’t know, but the last email I have to pool@lists.ntp.org was sent on 2020-12-27.
I have mailing list membership reminder mail from 2021-05-01 in my mailbox, but apparently nobody posted any message in between. Now the list is gone on lists.ntp.org, we can still access archival messages from other archive source.
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Yeah, it was about the same time. I honestly don’t recall if the trouble on the list host (not operated by the pool project) came first or using discourse did.
Discourse isn’t by any means perfect, but overall I think it’s working well for the kind of, uh, discourse we have in the community.