Cisco Cisco Email Security Appliance C160 Mode D'Emploi
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User Guide for AsyncOS 10.0 for Cisco Email Security Appliances
Chapter 9 Using Message Filters to Enforce Email Policies
Message Filter Rules
The allowed hosts notation can only identify sequences and numeric ranges of IP addresses (not
hostnames). For example, the following filter bounces any message not injected from IP addresses of
form
hostnames). For example, the following filter bounces any message not injected from IP addresses of
form
10.1.1.
x where
X
is
50
,
51
,
52
,
53
,
54
, or
55
.
Receiving Listener Rule
The
recv-listener
rule selects those messages received on the named listener. The listener name must
be the nickname of one of the listeners currently configured on the system. For example, the following
filter immediately delivers any message arriving from the listener named
filter immediately delivers any message arriving from the listener named
expedite
.
Receiving IP Interface Rule
The
recv-int
rule selects those messages received via the named interface. The interface name must be
the nickname of one of the interfaces currently configured for the system. For example, the following
filter bounces any message arriving from the interface named
filter bounces any message arriving from the interface named
outside
.
Date Rule
The
date
rule checks the current time and date against a time and date you specify. The date rule is
compares against a string containing a timestamp of the format
MM/DD/YYYY hh:mm:ss. This is useful to specify actions to be performed before or after certain times
MM/DD/YYYY hh:mm:ss. This is useful to specify actions to be performed before or after certain times
notMineFilter:
if (remote-ip != '10.1.1.50-55')
{
bounce();
}
expediteFilter:
if (recv-listener == 'expedite')
{
skip-filters();
}
outsideFilter:
if (recv-int == 'outside')
{
bounce();
}