That's great. thanks all.
Belt and suspenders (the first setting implies the second, and the third
should then never be used), in master.cf for the submission entry set:
-o { smtpd_tls_security_level = encrypt }
-o { smtpd_tls_auth_only = yes }
-o { smtpd_sasl_security_options = noanonymous, noplaintext, nodictionary }
-o { smtpd_sasl_tls_security_options = noanonymous }
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