Cisco Cisco Email Security Appliance C170 Guia Do Utilizador

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.

Determines behavior if source routing is detected 
in the “MAIL FROM” and “RCPT TO” addresses. 
Source routing is a special form of an email 
address using multiple ‘@’ characters to specify 
routing (for example: 
@one.dom@two.dom:joe@three.dom). If set to 
“reject,” the address will be rejected. If “strip,” the 
source routing portion of the address will be 
deleted, and the message will be injected normally.

discard

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