Cisco Cisco Email Security Appliance C170 Guia Do Utilizador

In a somewhat more complicated example, consider:

The system groups the expression from left to right, so this becomes:

This means the first thing the system does is compare the cost of 

(test1 AND test2)

 against the cost of 

test3

, evaluating the second AND first. If all three tests have the same cost, then 

test3

 will be 

performed first because 

(test1 AND test2)

 would be twice as expensive.

Each message filter contains a rule that defines the collection of messages that a filter can act upon. You 
define the filter rules, and then you define a filter action for messages that return 

true

. 

 

 summarizes the rules you can use in message filters.

if (test1 AND test2 AND test3) { ... }

if ((test1 AND test2) AND test3) { ... }

subject

Does the subject header match a certain pattern? 
See 

body-size

Is the body size within some range? See 

mail-from

Does the Envelope Sender (i.e., the Envelope 
From, <MAIL FROM>) match a given pattern? 
See 

mail-from-group

Is the Envelope Sender (i.e., the Envelope From, 
<MAIL FROM>) in a given LDAP group? See 

sendergroup

Which sender group was matched in a listener's 
Host Access Table (HAT)? See 

.

rcpt-to

Does the Envelope Recipient, (i.e. the Envelope 
To, <RCPT TO>) match a given pattern? See 

.

Note: The

 rcpt-to

 rule is message-based. If a 

message has multiple recipients, only one 
recipient has to match the rule for the specified 
action to affect the message to all recipients.