Cisco Cisco Email Security Appliance C650 Guía Del Usuario
Chapter 2 Configuring Routing and Delivery Features
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Cisco IronPort AsyncOS 7.5 for Email Advanced Configuration Guide
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Routing Email for Local Domains
In
you customized private and public
listeners to service SMTP connections for an Enterprise Gateway configuration.
Those listeners were customized to handle specific connections (via HAT
modification) and receive mail for specific domains (via RAT modification of
public listeners).
Those listeners were customized to handle specific connections (via HAT
modification) and receive mail for specific domains (via RAT modification of
public listeners).
The Cisco IronPort appliance routes mail to local domains to hosts specified via
the Network > SMTP Routes page (or the
the Network > SMTP Routes page (or the
smtproutes
command). This feature is
similar to the sendmail
mailertable
feature.
Note
If you have completed the GUI’s System Setup Wizard (or the Command Line
Interface
Interface
systemsetup
command) as described in the “Setup and Installation”
chapter of the Cisco IronPort AsyncOS for Email Configuration Guide and
committed the changes, you defined the first SMTP route entries on the appliance
for each RAT entry you entered at that time.
committed the changes, you defined the first SMTP route entries on the appliance
for each RAT entry you entered at that time.
SMTP Routes Overview
SMTP Routes allow you to redirect all email for a particular domain to a different
mail exchange (MX) host. For example, you could make a mapping from
mail exchange (MX) host. For example, you could make a mapping from
example.com
to
groupware.example.com
. This mapping causes any email with
@example.com
in the Envelope Recipient address to go instead to
groupware.example.com
. The system performs an “MX” lookup on
groupware.example.com
, and then performs an “A” lookup on the host,
just like
a normal email delivery. This alternate MX host does not need to be listed in DNS
MX records and it does not even need to be a member of the domain whose email
is being redirected. The IronPort AsyncOS operating system allows up to forty
thousand (40,000) SMTP Route mappings to be configured for your Cisco
IronPort appliance. (See
MX records and it does not even need to be a member of the domain whose email
is being redirected. The IronPort AsyncOS operating system allows up to forty
thousand (40,000) SMTP Route mappings to be configured for your Cisco
IronPort appliance. (See