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I have been using your plugin successfully for over a year with Outlook 365. Today, I went to set up a fallback connection for the occasional failed send, and I couldn’t get the plugin to send via Gmail. I get an authentication error every time.
I am following Google’s documentation: https://support.google.com/a/answer/176600
I use:
Connection Provider: Other SMTP
SMTP Host: smtp.gmail.com
Port: 587 (for TLS)
Encryption: TLS
Use Auto TLS: On
Authentication: On
SMTP Username & PW: My Gmail uname & pword