Cisco Cisco Email Security Appliance C170 사용자 가이드

If you enable envelope sender verification or disable allowing partial domains in SMTP Address Parsing 
options for a listener, the default domain settings for that listener will no longer be used.

These features are mutually exclusive.

To access the Advanced options, expand the section by clicking on Advanced in the listing.

Advanced configuration options include:

Add Received Header: Add a received header to all received email. A listener also modifies email 
that it relays by adding a Received: header on each message. If you do not want to include the 
Received: header, you can disable it using this option.

The Received: header is not added to the message within the work queue processing. Rather, it is added 
when the message is enqueued for delivery.

Disabling the received header is a way to ensure that your network’s topology is not exposed by 
revealing the IP addresses or hostnames of internal servers on any messages travelling outside your 
infrastructure. Please use caution when disabling the received header.

Usernames that include characters (such as % or !, for example) 
entered here will be rejected.

%!:@

Determines behavior for when an address literal is received that 
the system can not handle. Currently, this is everything except for 
IPv4. Thus, for example, for an IPv6 address literal, you can 
either reject it at the protocol level, or accept it and immediately 
hard bounce it.

Recipient addresses containing literals will cause an immediate 
hard bounce. Sender addresses may get delivered. If the message 
cannot be delivered, then the hard bounce will hard bounce 
(double hard bounce).

In the case of reject, both sender and recipient addresses will be 
rejected immediately at the protocol level.

reject