This article contains possible resolution steps for messages that cannot be sent or received in a network where Symantec Messaing Gateway (SMG) is deployed.
Messages are being bounced with the following error:
"554 5.7.1 This message has been blocked because it contains a banned word"
The most common cause of this problem is a network device (such as a firewall between the SMG and Internet) performing filtering operations on network communications out and in the network.
In order to resolve the problem, it is recommended to check the firewalls configuration and ensure there are no active filters on SMTP communications.