Recently our company has experienced an increase in the number of email messages being returned undelivered. The returned messages were initially returned with the Barracuda Reputation message "Client host (host.hosting company name.com) blocked using Barracuda Reputation". A check of the domain IP address indicated that it was marked as poor on the Barracuda Reputation System. The last bunch of returned messages only mentioned the following: "A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:"
The returned email messages are genuine and delivery has been successful before this problem started. Thanks