Cisco Cisco Email Security Appliance C160 Mode D'Emploi

The following filter checks the workqueue count, and skips spam check if the queue is greater than the 
specified number.

For more information on SPF/SIDF, see 

.

If your Cisco appliance uses SMTP authentication to send messages, the 

smtp-auth-id-matches

 

(

<target> [, <sieve-char>]

)

rule can check a message’s headers and Envelope Sender against the 

sender’s SMTP authenticated user ID to identify outgoing messages with spoofed headers. This filter 
allows the system to quarantine or block potentially spoofed messages.

The 

smtp-auth-id-matches 

rule compares the SMTP authenticated ID against the following targets: 

The filter performs matches loosely. It is not case-sensitive. If the optional sieve-char parameter is 
supplied, the last portion of an address that follows the specified character will be ignored for the 
purposes of comparison. For example, if the 

+

 character is included as a parameter, the filter ignores the 

portion of the address 

joe+folder@example.com

 that follows the 

+

 character. If the address was 

joe+smith+folder@example.com

, only the 

+folder

 portion is ignored. If the SMTP authenticated user 

ID string is a simple username and not a fully-qualified e-mail address, only the username portion of the 
target will be examined to determine a match. The domain must be verified in a separate rule.

Also, you can use the $SMTPAuthID variable to insert the STMP authenticated user ID into headers.

The following table shows examples of comparisons between the SMTP authenticated ID and email 
addresses and whether they would match using the 

smtp-auth-id-matches 

filter rule:

 wqfull: 

if (workqueue-count > 1000) {

 skip-spamcheck();

}

*EnvelopeFrom

Compares the address of the Envelope Sender (also known 
as MAIL FROM) in the SMTP conversation

*FromAddress

Compares the addresses parsed out of the From header. 
Since multiple addresses are permitted in the From: 
header, only one has to match.

*Sender

Compares the address specified in the Sender header.

*Any

Matches messages that were created during an 
authenticated SMTP session regardless of identity. 

*None

Matches messages that were not created during an 
authenticated SMTP session. This is useful when 
authentication is optional (preferred).

someuser

otheruser@example.com

No

someuser

someuser@example.com

Yes