Technical details of permanent failure:
PERM_FAILURE: Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 550 550 5.1.1 <DR-LOCKOUT@play.net>... User unknown (state 14).

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"Failure is not our only punishment for laziness: there is also the success of others."
Jules Renard