We have an MS Exchange 2003 server that's used by several of our facilities and suddenly people are getting the follow error.
There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
<server1.mydomain.ORG #5.5.0 smtp;550 bosauthsmtp11: Host 63.xxx.xxx.83: No unauthenticated relaying permitted>
Has anyone seen this error?