F-SECURE ANTI-VIRUS FOR MICROSOFT EXCHANGE 8.00 Administrator's Manual page 62

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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.
If F-Secure Anti-Virus for Microsoft Exchange has been installed in the
centralized administration mode, configure the mail direction with
F-Secure Policy Manager Console. For more information, see
Configuration", 77.
If F-Secure Anti-Virus for Microsoft Exchange has been installed in
stand-alone mode, configure the mail direction with F-Secure Anti-Virus
for Microsoft Exchange Web Console. For more information, see
"Network Configuration", 247.
"Network