Cisco Cisco Email Security Appliance C170 Guía Del Usuario
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Cisco AsyncOS 8.0.2 for Email User Guide
Chapter 13 Anti-Spam
Determining Sender IP Address In Deployments with Incoming Relays
For IPv6 addresses, AsyncOS supports the following formats:
•
2620:101:2004:4202::0-2620:101:2004:4202::ff
•
2620:101:2004:4202::
•
2620:101:2004:4202::23
•
2620:101:2004:4202::/64
Step 5
Specify the header that will identify the IP address of the original external sender.
When entering a header, you do not need to enter the trailing colon.
a.
Select the header type:
Choose custom headers (recommended) or Received headers.
b.
For custom headers:
Enter the header name that you configured the relaying machine to add to relayed messages.
For example:
SenderIP
or
X-CustomHeader
c.
For Received headers:
Enter the character or string after which the IP address will appear. Enter the number for the “hop”
to check for the IP address.
to check for the IP address.
Step 6
Submit and commit your changes.
What To Do Next
Consider doing the following:
•
Add the relaying machine to a sender group with a mail flow policy that has unlimited messages for
DHAP. For an explanation, see
DHAP. For an explanation, see
•
To facilitate tracking and troubleshooting, configure the appliance logs to show which header is
used. See
used. See
.
Related Topics
•
Message Headers for Relayed Messages
You will configure your appliance to use one of the following types of header to identify the original
sender of a relayed message:
sender of a relayed message:
•
•