F-SECURE ANTI-VIRUS - FOR MICROSOFT EXCHANGE Administrator's Manual page 22

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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.
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.