Gmail SMTP authentication
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I'm not entirely sure just ensuring 2FA is enabled will work. In Google's message, they mention using either Sign In With Google or OAuth2. 'Sign In With Google' is one of their APIs, I don't think they are using it in the generic sense, sign-in with Google. https://developers.google.com/identity/gsi/web
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I'm not sure how it works in the background for initiating this request for access, but for my Synology NAS I recently set up email notifications. In the process of configuring it, it went to a Google page asking to authorize access to send emails on my behalf. Going to the Security page of my Google account and viewing the 'Third-Party Apps with Account Access', I now have Synology listed; perhaps your app will have to obtain the same authorization.
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J JonB referenced this topic on
