There is currently a similar thread on "mailop" mailing list about
connections from MS to *submission* ports, that connect, do valid AUTH
(using proper credentials!) and then hang up.
People in that thread suspect that this behavior might be associated with
connections from Outlook mobile app being proxied by MS servers. Probably
something went wrong there.
No definite conclusion yet.
thx for the ref -- found the thread on mailop.
not exactly the same issue to my read, but there may be more to it?
in any case, it'd be at least consistent some legit sends from *outlook.com
making it thru, and such other mobile/proxied attempts not.
wait -n- see ...
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