Sidewinder G2 6.1.2 Administration Guide - Glossary of Technical ...

Chapter 12: Electronic Mail
Overview of e-mail on Sidewinder G2
When you configure secure split SMTP services, there are three separate
sendmail servers that each have a different purpose.
• Local
The local server handles mail that is sent directly from the Sidewinder G2.
For example, if an administrator sends a mail message from the Sidewinder
G2, it is sent through the local server. This sendmail process runs in the
mtac domain and forwards all mail to the internal network side of the
Sidewinder G2.
• Internal
The internal server runs in a trusted burb that you specify when running
Reconfigure Mail. This sendmail daemon receives mail from one of three
sources:
– a host on the internal network
– a sendmail process transferring mail from the local sendmail server
– a sendmail process transferring mail from the external sendmail server
The internal server delivers mail to one of three places:
– If the message is for a user local to the Sidewinder G2, such as an
administrator with a mailbox on the Sidewinder G2, it delivers the
message to the user’s mailbox using the mail.local program.
– If the message is for a user on the internal network, it connects to the
mail host on the internal network and delivers the mail there.
– If the message is not for either of the above, it assumes the message is
for an external user and transfers the message to the external burb for
that user.
• External
The external server runs in the mta# domain (# is the burb index of the
Internet burb). This sendmail daemon receives mail from one of two
sources:
– a host on the external network
– a sendmail process transferring mail from the internal sendmail server
The external server delivers mail to one of two places:
• If the message is for an external user, it connects to an external host
and delivers the mail there.
• If the message is for a user local to the Sidewinder G2 (such as an
administrator) or for a user on the internal network, it transfers the
mail to the internal burb for delivery to that user.
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