Switched to google workspace oauth email and getting too many login attempts error

[NealC]

I created a google workspace to send email through gmail using the oauth. Email tests went fine and then I tried sending 1600 emails to my users that need to complete their registrations due to email reliability issues I have with exchange. I'm getting the following error. How can we use gmail and be able to email our users from the forum such as for mass emails?

• Authenticator XOAUTH2 returned Expected response code 250 but got code "454", with message "454-4.7.0 Too many login...

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Switched to google workspace oauth email and getting too many login attempts error

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