This needs a solution since some time now. By creating such a bogus E-Mail you can generate an infinite mails in the queue.
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- Swift_TransportException: Email to X@X.jp??? from support@X.org failed: Expected response code 354 but got code "554", with message "554 5.5.1 Error: no valid recipients "
- src/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/AbstractSmtpTransport.php:459
- ...
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