Cisco Cisco Email Security Appliance C160 Mode D'Emploi

You can set the behavior of AsyncOS regarding modifying the encoding of 
message headings and footers during message processing. This setting is not 
configured via the GUI. Instead, it is configured via the 

localeconfig

 in the CLI. 

Configure whether to perform HAT rejection at the 
message recipient level.By default, HAT rejected 
connections will be closed with a banner message at the 
start of the SMTP conversation.

When an email is rejected due to HAT “Reject” settings, 
AsyncOS can perform the rejection at the message 
recipient level (RCPT TO), rather than at the start of the 
SMTP conversation. Rejecting messages in this way delays 
the message rejection and bounces the message, allowing 
AsyncOS to retain more detailed information about the 
rejected messages. For example, you can see the mail from 
address and each recipient address of the message which is 
blocked. Delaying HAT rejections also makes it less likely 
that the sending MTA will perform multiple retries.

When you enable HAT delayed rejection, the following 
behavior occurs:

--The MAIL FROM command is accepted, but no message 
object is created.

--All RCPT TO commands are rejected with text explaining 
that access to send e-mail is refused.

--If the sending MTA authenticates with SMTP AUTH, 
they are granted a RELAY policy and are allowed to deliver 
mail as normal.

NOTE: Only configurable from the CLI 

listenerconfig

 

--> 

setup

 command.