F-SECURE ANTI-VIRUS - FOR MICROSOFT EXCHANGE Administrator's Manual page 203

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.
To scan or filter messages from internal hosts on Microsoft
Exchange Server 2003, use corresponding real-time scanning
settings in the storage protection section.
Internal Domains
Internal SMTP
senders
Administration with Web Console
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
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.*
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