XOAUTH2 authentication mechanism not supported

  • We’re constantly getting ‘Post SMTP email error’ emails with this error: XOAUTH2 authentication mechanism not supported.

    We’re using the Gmail API and have set up the plugin correctly with the client ID and secret via the Google API console. Looking in the Logs section of the plugin, the error only appears for some, not all emails sent from the website.

    Your plugin description says this error is down to the website being on a VPS (which it is), but the support thread you link to is over 8 years old and there is no solution, just “move to non-VPS hosting”! Surely there’s an actual fix for this??

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