Cisco Cisco Email Security Appliance C170 Guia Do Utilizador

Sign first _ bytes. Sign the message body up to the specified number of bytes. 

Select the tags you want to include in the message signature’s header field. The information stored in 
these tags are used for message signature verification. Select one or more of the following options:

“i” Tag. The identity of the user or agent (e.g., a mailing list manager) on behalf of which this 
message is signed. Enter the domain name prepended with the 

@

 symbol, such as the domain 

@example.com

.

“q” Tag. A colon-separated list of query methods used to retrieve the public key. Currently, the only 
valid value is dns/txt.

“t” Tag. A timestamp for when the signature was created.

“x” Tag. The absolute date and time when the signature expires. Specify an expiration time (in 
seconds) for the signature. The default is 

31536000

 seconds.

“z” Tag. A vertical bar-separated (i.e., 

|

) list of header fields present when the message was signed. 

This includes the names of the header fields and their values. For example:

z=From:admin@example.come|To:joe@example.com| 

Subject:test%20message|Date:Date:August%2026,%202011%205:30:02%20PM%20-0700

Enter users (email addresses, hosts, etc.) that will use the domain profile for signing.

When you create domain profiles, be aware that a hierarchy is used in determining the profile to associate 
with a particular user. For example, you create a profile for example.com and another profile for 
joe@example.com. When mail is sent from joe@example.com, the profile for joe@example.com is 
used. However, when mail is sent from adam@example.com, the profile for example.com is used.

Submit and commit your changes.

At this point (if you have not already) you should enable DomainKeys/DKIM signing on an outgoing 
mail flow policy (see 

If you create both a DomainKeys and DKIM profile, AsyncOS performs both DomainKeys and 
DKIM signing on outgoing mail.

Signing keys are required for domain profiles for DomainKeys and DKIM signing. 

Choose Mail Policies > Signing Keys. 

Click Add Key. 

Enter a name for the key.