First, CU6 failed on the mailbox role. The solution: remove the Discovery mailbox. Then setup successfully completed. (Remember to recreate the discovery mailbox!)
After I restarted the Exchange servers, mail was stuck in the drafts folder. I tested mailflow using the "test-mailflow" cmdlet, and saw it failed (not that stuck messages in OWA weren't enough):
A quick search pointed to DNS or Security policy problems. Not in our case. Next check, were all services running...."Test-ServiceHealth"
No...Two services were disabled: MS Exchange Transport Delivery (MSExchangeDelivery) and MS Exchange Transport Submission (MSExchangeSubmission.) Restarting those services made the mail flow once more!
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