Cisco Cisco Email Security Appliance C650 Guía Del Usuario
9-100
User Guide for AsyncOS 9.8 for Cisco Email Security Appliances
Chapter 9 Using Message Filters to Enforce Email Policies
Using the CLI to Manage Message Filters
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).
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.
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
for more information.
body works. Please see “Disclaimer Stamping and Multiple Encodings” in the “Text Resources” chapter
for more information.
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
.
•
The third filter is named
mailfrompm
. It uses
mail-from
rule examines all mail from
postmaster@example.com
and blind-carbon copies
administrator@example.com
.
Using the
filter -> list
subcommand, the filters are listed to confirm that they are active and valid,
and then the first and last filters are switched in position using the
move
subcommand. Finally, the
changes are committed so that the filters take effect.
- SETUP - Configure multi-lingual settings.
mail3.example.com> filters
Choose the operation you want to perform:
- NEW - Create a new filter.
- IMPORT - Import a filter script from a file.
[]> new
Enter filter script. Enter '.' on its own line to end.
big_messages:
if (body-size >= 10M) {
drop();
}
.