Topic: Delivery Status Notification (Failure)
We have installed iredmail on CentOS5 which was running well. But from few days we have been facing a problem that mail bounce from iredmail for an user whose iredmail id (firstname.lastname@example.org) is used as forwared of gmail id (email@example.com), When gmail ID received email, some email are bounced from iredmail.The failure notification as bellow:
Delivery to the following recipient failed permanently:
Technical details of permanent 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: 551 551 Unknown user. (state 14).
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