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The email sistems was working well but it beggun to have a mistake, it doesn´t send emails, support told me is a host provider problem, and the smtp show me this screen enter image description here

Luis Fernando Morla Mora
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    The error message says it clearly that you need OAuth2 authentication to Google servers. There probably is some OAuth2 plugin for Wordpress, you must install it & configure according to it's documentation. – raj Jan 21 '21 at 13:36
  • It's within the plugin they are using, WP SMTP Mail, and authentication can be configured there. – DubStep Jan 21 '21 at 14:45

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