Cisco Cisco Email Security Appliance X1050 Guía Del Usuario
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Cisco IronPort AsyncOS 7.5 for Email Configuration Guide
OL-25136-01
Chapter 8 Anti-Spam
Incoming Relays and Reporting
When using Incoming Relays, the SenderBase Reputation score is not reported
correctly in the Email Security Monitor reports. Also, sender groups may not be
resolved correctly.
correctly in the Email Security Monitor reports. Also, sender groups may not be
resolved correctly.
IP Addresses
As a general rule, when specifying an IP address (of the machine connecting to
the Cisco IronPort appliance — the incoming relay), be as specific as possible.
That said, IP addresses can also be entered using standard CIDR format or an IP
address range. For example, if you have several MTAs at the edge of your network
receiving email, you might want to enter a range of IP addresses to include all of
your MTAs, such as 10.2.3.1/8 or 10.2.3.1-10.
the Cisco IronPort appliance — the incoming relay), be as specific as possible.
That said, IP addresses can also be entered using standard CIDR format or an IP
address range. For example, if you have several MTAs at the edge of your network
receiving email, you might want to enter a range of IP addresses to include all of
your MTAs, such as 10.2.3.1/8 or 10.2.3.1-10.
Message Headers and Incoming Relays
Custom Header
Use this method to specify a custom header. This is the recommended method.
The machine connecting to the original sender needs to add this custom header.
The value of the header is expected to be the IP address of the external sending
machine. For example:
The machine connecting to the original sender needs to add this custom header.
The value of the header is expected to be the IP address of the external sending
machine. For example:
SenderIP: 7.8.9.1
X-CustomHeader: 7.8.9.1
When entering a header, you do not need to enter the trailing colon.
If your local MX/MTA can receive mail from a variable number of hops, inserting
a custom header is the only way to enable the Incoming Relays feature. For
example, in
a custom header is the only way to enable the Incoming Relays feature. For
example, in
both path C and D lead to IP address 10.2.3.5; however,
path C has two hops and path D has one. Because the number of hops can vary in
this situation, you must use a custom header in order to have Incoming Relays
configured correctly.
this situation, you must use a custom header in order to have Incoming Relays
configured correctly.