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As Avalara continues to improve their security protocols, TLS 1.0 and 1.1 will be deprecated as of March 31, 2022. Please review Avalara's Announcement HERE and also Sage KB 114325 for more information.
KB ID: 72613 Last Modified Date: 6-24-2019 states this enhancement request is already here; but I was unable to find it.
It's almost 2020, Sage X3 should be able to send emails to SSL & TLS authenticated email servers with a non standard port#.