Cisco Cisco Email Security Appliance C190 用户指南

Override SMTP Banner Host 
Name

By default, the appliance will include the hostname associated with the 
interface of the listener when displaying the SMTP banner to remote 
hosts (for example: 

220-

 ESMTP

). You may choose to override 

this banner by entering a different hostname here. Additionally, you 
may leave the hostname field blank to choose not to display a hostname 
in the banner. 

Max. Recipients per Hour 

The maximum number of recipients per hour this listener will receive 
from a remote host. The number of recipients per sender IP address is 
tracked globally. Each listener tracks its own rate limiting threshold; 
however, because all listeners validate against a single counter, it is 
more likely that the rate limit will be exceeded if the same IP address 
(sender) is connecting to multiple listeners.

You can use some variables in this field. For more information, 
see 

.

Max. Recipients per Hour 
Code

The SMTP code returned when a host exceeds the maximum number of 
recipients per hour defined for this listener.

Max. Recipients Per Hour 
Exceeded Text

The SMTP banner text returned when a host exceeds the maximum 
number of recipients per hour defined for this listener.

Max. Recipients per Time 
Interval

The maximum number of recipients during a specified time period that 
this listener will receive from a unique envelope sender, based on the 
mail-from address. The number of recipients is tracked globally. Each 
listener tracks its own rate limiting threshold; however, because all 
listeners validate against a single counter, it is more likely that the rate 
limit will be exceeded if messages from the same mail-from address are 
received by multiple listeners.

Select whether to use the default maximum recipients, accept unlimited 
recipients, or specify another maximum number of recipients.

Use the Default Mail Flow Policy settings to specify the maximum 
number of recipients and the time interval that will be used by the other 
mail flow policies by default. The time interval can only be specified 
using the Default Mail Flow Policy.

Sender Rate Limit Exceeded 
Error Code

The SMTP code returned when an envelope exceeds the maximum 
number of recipients for the time interval defined for this listener.

Sender Rate Limit Exceeded 
Error Text

The SMTP banner text returned when an envelope sender exceeds the 
maximum number of recipients for the time interval defined for this 
listener.

Exceptions

If you want certain envelope senders to be exempt from the defined rate 
limit, select an address list that contains the envelope senders. See 

 for more information.