New order notification has email send error

Mail send issues…..

Using WP SMTP Mail and ATT as the smtp.

Test emails work but Woocommerce generated “new order placed” does not get received. Log shows mailbox error.

Mailer: Other SMTP
SMTP Error: data not accepted.SMTP server error: DATA END command failed Detail: Request failed; Mailbox unavailable
SMTP code: 550

Could your plugin effect emails?

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