Aaargh! No more STARTTLS!

[George Mitchell]

FreeBSD 10.3-RELEASE-p20
Base system sendmail

Some time between 8:17 AM and 12:06 PM on the 17th of July, my sendmail
stopped offering STARTTLS, for no reason I can determine.  My last
system rebuild (for 10.3-p20) was on July 12.  My LetsEncrypt cert was
last renewed on June 10 and will remain valid until September 8.  I
don't know of anything else that happened on July 17.  Outgoing STARTTLS
seems to have continued working.  What did I do wrong this time??
-- George

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