IBM Proventia Getting Started Manual page 17

IBM Proventia Network Mail Security System Getting Started Guide, Version 1.6
The System Administrator for the internal mail server should make sure
that all outgoing email messages are being relayed through the appliance
(by configuring the relay host/smart host for outgoing mail). If the IP
addresses for the internal mail servers have not been configured as relay
hosts, email messages may be denied by the built-in anti-relay check that
protects the appliance from being used by unauthorized users or
spammers to send unsolicited junk mail to other Internet users.
The appliance delivers email messages to external mail domains as
follows:
Performs direct MX DNS lookups and then sends the email messages
●
via SMTP directly to responsible servers on the Internet.
Forwards all outgoing email messages to another mail relay.
●
See the chapter on SMTP Settings in the IBM Proventia
Reference:
Network Mail Security System Administrator Guide at
http://www.iss.net/support/documentation
configuration process for SMTP settings in more detail.
Understanding SMTP Mail Routing
that describes the
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