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Hello, the plugin just suddenly ceased working on Monday, January 12, 2020. No site updates reconfiguration made since January 3, 2020.
While looking for a solution, came across the following statement from Microsoft:
Beginning November 1st, 2019, Office 365 is slowly turning off the TLS cipher algorithm 3DES. If you are using devices or applications that only support 3DES, TLS will start failing. As TLS is mandatory for the SMTP AUTH client submission (also known as Authenticated SMTP or SMTP AUTH for short), you may experience emails no longer sending. You will need to upgrade or update all of your devices and applications to use the new TLS version and ciphers.