Cisco Cisco Email Security Appliance X1050 Guide De Dépannage

Contributed by Jackie Fleming and Stephan Bayer, Cisco TAC
Engineers.

Jul 31, 2014

There are three features that control which IP interface will be used for message delivery:

The 

 CLI command controls primary IP interface for all mail delivery. By

default, this is set to "Auto," which will deliver mail based on destination IP subnet. If the destination
IP is a local subnet, it will use an IP interface that is on that subnet. If the destination IP is not a local
subnet, the messages will be delivered from an IP interface on the same subnet as the default gateway.

• 

The 

 table overrides the 

deliveryconfig

 setting for specific messages. In this

table, you must specify the source IP address or Envelope From to match on and the IP interface to
use when the match occurs. This table is configured using the 

altsrchost

  CLI command.

• 

The 

 Message Filter action can be used to specify the IP interface for message

delivery as an action for your choice of criteria using Message Filter rules. This will override
both 

deliveryconfig

 and the 

altsrchost

  table. Should you choose to set up a filter,

reviewing the section titled Message Filters in the AsyncOS Advanced User Guide is highly
recommended.

• 

As you can see, there are several options for how to configure the IP address used for message delivery. In
order to decide which method to use, you have to determine:

From which IP interface should the majority of your messages be delivered?

• 

Are there any special cases?

• 

For each special case, what is the unique trigger that should be used to set the IP address used for
message delivery?

• 

Once you know the answers to these questions, you will know which method or combination of methods is
best for your environment. More details on these features can be found in the Content Security User Guides.

For more information about message filters, email delivery parameters and setting up virtual gateway
addresses, see the AsyncOS User Guide on the Cisco Support Site.

Updated: Jul 31, 2014

Document ID: 118132