Cisco Cisco Email Security Appliance C170 Guia Do Utilizador

Partial email address: 

user@

All users in a domain: 

@example.com

All users in a partial domain: 

@.example.com

All users from a host with a certain IP address: 

@[1.2.3.4]

 

Note that domains and IP addresses must start with a 

@

 character.

Separate email addresses with a comma. If you separate the addresses using a new line, AsyncOS 
automatically converts your entries into a comma-separate list.

Submit and commit your changes.

Select Mail Policies > Address Lists.

Click the name of the address list you want to edit.

Modify the address list.

Submit and commit your changes.

To delete an address list, check the Delete check box next to the message action you want to delete. A 
confirmation message notifies you if any mail flow policies use the address list. Deleting a list removes 
it from the mail flow policies that use it. Commit your changes.

Spam and unwanted mail is frequently sent by senders whose domains or IP addresses cannot be resolved 
by DNS. DNS verification means that you can get reliable information about senders and process mail 
accordingly. Sender verification prior to the SMTP conversation (connection filtering based on DNS 
lookups of the sender’s IP address) also helps reduce the amount of junk email processed through the 
mail pipeline on the Cisco IronPort appliance.

Mail from unverified senders is not automatically discarded. Instead, AsyncOS provides sender 
verification settings that allow you to determine how the appliance handles mail from unverified senders: 
you can configure your Cisco IronPort appliance to automatically block all mail from unverified senders 
prior to the SMTP conversation or throttle unverified senders, for example.

The sender verification feature consists of two components: verification of the connecting host, which 
occurs prior to the SMTP conversation, and verification of the domain portion of the envelope sender, 
which occurs during the SMTP conversation.