Answer
Yes, Mail Marshall can reside on the same machine as your primary mail server – GMS, GMS Mail, or GMS Webmail.
The ports for SMTP inbound and outbound email must be changed in GMS and Mail Marshall configured in the appropriate way (please see the documentation that comes with Maill Marshall for details).
A more resiliant solution would be to simply purchase the anti-spam and content filtering option from Gordano (GMS Anti-Spam). This can provide all the content filtering that is required and works seamlessly with GMS Mail and GMS Webmail.
See Also:
Keywords:Mail Marshall MailMarshall antispam content filtering AS AV anti-spam