Cisco Cisco Email Security Appliance C680 User Guide

The HAT syntax allows for the signficant_bits configuration option. When editing 
the default or a specific mail flow policy in a HAT (for example, when issuing the 

listenerconfig -> edit -> hostaccess -> default

 command) the following 

questions appear if:

rate limiting is enabled, and 

using SenderBase for flow control is disabled, or

Directory Harvest Attack Prevention (DHAP) is enabled for a mail flow 
policy (default or specific mail flow policy) 

 For example:

Do you want to enable rate limiting per host?  [N]> y

Enter the maximum number of recipients per hour from a remote host.

[]> 2345

Would you like to specify a custom SMTP limit exceeded response? [Y]> 

Would you like to use SenderBase for flow control by default?  [N]> n

Would you like to group hosts by the similarity of their IP 

addresses?  [N]> y

Enter the number of bits of IP address to treat as significant, from 

0 to 32.

[24]>