I have an internal user sending his email via our Exchange 2007, but this email was bounced back due to the content restriction.
Your message wasn't delivered because of security policies. Microsoft Exchange will not try to redeliver this message for you. Please provide the following diagnostic text to your system administrator.
The following organization rejected your message: smtp.exchange.iinet.net.au.
Diagnostic information for administrators:
Generating server: polonium.mailguard.com.au
smtp.exchange.iinet.net.au #<smtp.exchange.iinet.net.au #5.7.1 smtp; 550 5.7.1 Message rejected due to content restrictions> #SMTP#
We are using filtering service from Mailguard. Was this email rejected by our mail filtering system or recipient's email server?