F-SECURE INTERNET GATEKEEPER WINDOWS 2000-2003 SERVER 6.61 Administrator's Manual page 350

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Environment:
F-Secure Anti-Virus for Internet Mail is installed on the host
smtp.my.intranet instead of the original Mail Transfer Agent.
No changes are needed in DNS. The DNS MX records point
my.sub1.domain and my.sub2.domain to the smtp.my.intranet
host (or to the host running the firewall). All inbound mails come
to F-Secure Anti-Virus for Internet Mail running at
smtp.my.intranet host.
No changes are needed in the firewall. Incoming and outgoing
SMTP connections are allowed to/from smtp.my.intranet host.
No changes are needed on mail servers and end-user
workstations in sub-domain networks.
F-Secure Anti-Virus for Internet Mail configuration:
F-Secure Anti-Virus for Internet Mail is configured to accept
incoming connections on port 25.
F-Secure Anti-Virus for Internet Mail is configured to accept mail
from the firewall, smtp.my.sub1.intranet and
smtp.my.sub2.intranet hosts only.
smtp.my.sub1.intranet and smtp.my.sub2.intranet hosts are
specified in the Intranet Hosts table. All mail coming from these
hosts will be treated as outbound.