I have this half figured out (SMTP is working now, IMAP still broken). FWIW, it was a cert / key issue - the autorenewed ones from certbot didn't f...

Bueller? Bueller? Bueller? Bueller? Bueller? Bueller?

In case anyone else runs across this issue, there was a "domain wide grant" applied that caused the mailbox to be visible other mailboxes. The command...

Are there other ways to review / modify mailbox delegations to specific user accounts?

Any other ideas on what to troubleshoot? It appears the right service is running, but there's bad communications between it. Nothing detailed in the l...

Any additional thoughts on how to troubleshoot this? We dug in a little deeper but nothing seems to connect to the backend service properly.

Any ideas on other ways to modify permissions, or see actual settings applied to a delegated account?

Correction above, the TARGET_MAILBOX and MAILBOX_GETTING_ACCESS are swapped. We also tried "" and literally nothing instead of none, but those are ...

The assumption of 143 > 7143 and 993 > 7993 seems sound - and that's what our configuration has. Double checking that 7993 Imap Server is run...