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I receive this error only for emails triggered in WooCommerce if they are HTML. The test email and plain text emails send fine. Emails from a cart abandonment plugin send fine. I have gone through the SMTP settings with the host and there is no error. It makes no difference if Force Name is used or not. The from email is the same as the SMTP name. Host is one.com.
Worked with no issues until Wednesday. Any assistance appreciated!
