Cisco Cisco Email Security Appliance C170 사용자 가이드

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Chapter 6      Using Message Filters to Enforce Email Policies
6-40
Cisco IronPort AsyncOS 7.5 for Email Advanced Configuration Guide
OL-25137-01
Recipient Count Rule
The 
rcpt-count
 rule compares the number of recipients of a message against an 
integer value, in a similar way to the 
body-size
 rule. This can be useful for 
preventing users from sending email to large numbers of recipients at once, or for 
ensuring that such large mailing campaigns go out over a certain Virtual Gateway 
address. The following example sends any email with more than 100 recipients 
over a specific Virtual Gateway address:
   } else {
        alt-src-host('interface_b');
   }
load_balance_b:
   if (random(2)) {
       alt-src-host('interface_a');
   } else {
       alt-src-host('interface_b');
   }
large_list_filter:
   if (rcpt-count > 100) {
        alt-src-host('mass_mailing_interface');
   }