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I receive this error with every second post and have to re-authorize gmail to send mail.
EMAIL DELIVERY ERROR: the plugin WP Mail SMTP v2.9.0 logged this error during the last time it tried to send an email:
Mailer: Gmail
{
"error": "invalid_grant",
"error_description": "Token has been expired or revoked."
}
Please re-grant Google app permissions!
Go to WP Mail SMTP plugin settings page. Click the “Remove Connection” button.
Then click the “Allow plugin to send emails using your Google account” button and re-enable access.