F-SECURE ANTI-VIRUS FOR MICROSOFT EXCHANGE 8.00 Administrator's Manual page 77

Network Configuration
The mail direction is based on the Internal Domains and Internal SMTP
senders settings and it is determined as follows:
1. E-mail messages are considered internal if they come from internal
SMTP sender hosts and mail recipients belong to one of the specified
internal domains (internal recipients).
2.
E-mail messages are considered outbound if they come from
internal SMTP sender hosts and mail recipients do not belong to the
specified internal domains (external recipients).
3.
E-mail messages that come from hosts that are not defined as
internal SMTP sender hosts are considered inbound.
4.
E-mail messages submitted via MAPI or Pickup Folder are treated as
if they are sent from the internal SMTP sender host.
If e-mail messages come from internal SMTP sender hosts and
contain both internal and external recipients, messages are split
and processed as internal and outbound respectively.
Internal Domains
Internal SMTP
Senders
Centrally Managed Administration
Specify internal domains. Messages coming to
internal domains are considered to be inbound
mail unless they come from internal SMTP
sender hosts.
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.
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