IronPort - advanced configuration guide

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Cisco IronPort AsyncOS 7.6 for Email Advanced Configuration Guide
Chapter 6 Using Message Filters to Enforce Email Policies
Footers or headings are added in-line with the message body whenever
possible. However, if the footer or heading is encoded differently
than the message body,and if imposing a single encoding will cause
loss of characters, it will be added as an attachment. The system will
always try to use the message body's encoding for the footer or
heading. If that fails, and if the message body's encoding is US-
ASCII, the system can try to edit the message body to use the footer's
or heading's encoding. Should the system try to impose the footer's
or headings's encoding on the message body? [N]> y
Behavior when modifying headers: Use encoding of message body
Behavior for untagged non-ASCII headers: Impose encoding of message
body. Behavior for mismatched footer or heading encoding: Try both
body and footer or heading encodings
Choose the operation you want to perform:
- SETUP - Configure multi-lingual settings.
The first prompt determines whether or not a message header’s encoding should be changed to match
that of the message body if the header is changed (via a filter, for example).
The second prompt controls whether or not the appliance should impose the encoding of the message
body on the header if the header is not properly tagged with a character set.
The third prompt is used to configure how disclaimer stamping (and multiple encodings) in the message
body works. Please see “Disclaimer Stamping and Multiple Encodings” in the “Text Resources” chapter
in the Cisco IronPort AsyncOS for Email Configuration Guide for more information.
Creating Sample Message Filters
In the following example, the filter command is used to create three new filters:
The first filter is named big_messages. It uses the body-size rule to drop messages larger than 10
megabytes.
The second filter is named no_mp3s. It uses the attachment-filename rule to drop messages that
contain attachments with the filename extension of .mp3.
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