Cisco Cisco Email Security Appliance C160 Mode D'Emploi
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Cisco IronPort AsyncOS 7.3 for Email Advanced Configuration Guide
OL-23081-01
Chapter 2 Customizing Listeners
Advanced Configuration Options
To access the Advanced options, expand the section by clicking on Advanced in
the listing.
the listing.
Figure 2-7
Listeners Advanced Options
Advanced configuration options include:
•
Add Received Header: Add a received header to all received email. A listener
also modifies email that it relays by adding a Received: header on each
message. If you do not want to include the Received: header, you can disable
it using this option.
also modifies email that it relays by adding a Received: header on each
message. If you do not want to include the Received: header, you can disable
it using this option.
Note
The Received: header is not added to the message within the work queue
processing. Rather, it is added when the message is enqueued for delivery.
processing. Rather, it is added when the message is enqueued for delivery.
Disabling the received header is a way to ensure that your network’s topology
is not exposed by revealing the IP addresses or hostnames of internal servers
on any messages travelling outside your infrastructure. Please use caution
when disabling the received header.
is not exposed by revealing the IP addresses or hostnames of internal servers
on any messages travelling outside your infrastructure. Please use caution
when disabling the received header.
•
Change bare CR and LF characters to CRLF: New feature, converts bare CR
and LF characters to CRLF characters
and LF characters to CRLF characters
•
Use SenderBase IP Profiling
–
Timeout for Queries
–
SenderBase Timeout per Connection
•
Maximum Connections
•
TCP Listen Queue Size (the backlog of connections that AsyncOS will
manage before the SMTP server accepts them)
manage before the SMTP server accepts them)