F-SECURE ANTI-VIRUS FOR MICROSOFT EXCHANGE 9.00 Administrator's Manual - page 197
CHAPTER 3
195
Administration with Web Console
On Microsoft Exchange Server 2003, internal messages which are
submitted via MAPI or Pickup Folder are not delivered via transport
level. Therefore, those messages do not pass Transport Protection
and they are checked on the storage level only.
Internal Domains
Specify internal domains.
Separate each domain name with a space. You
can use an asterisk (*) as a wildcard. For
example, *example.com internal.example.net
Internal SMTP
senders
Specify the IP addresses of hosts that belong to
your organization. Specify all hosts within the
organization that send messages to Exchange
Edge or Hub servers via SMTP as Internal
SMTP Senders.
Separate each IP address with a space. An IP
address range can be defined as:
a network/netmask pair (for example,
10.1.0.0/255.255.0.0), or
a network/nnn CIDR specification (for
example, 10.1.0.0/16).
You can use an asterisk (*) to match any number
or dash (-) to define a range of numbers. For
example,
172.16.4.4 172.16.*.1 172.16.4.0-16
172.16.250-255.*
If end-users in the organization use other than
Microsoft Outlook e-mail client to send and
receive e-mail, it is recommended to specify all
end-user workstations as Internal SMTP
Senders.
If the organization has Exchange Edge and Hub
servers, the server with the Hub role installed
should be added to the Internal SMTP Sender
on the server where the Edge role is installed.