Cisco Cisco Email Security Appliance C160 Mode D'Emploi

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:

The 

addr-count()

 message filter rule takes one or more header strings, counts the number of recipients 

in each line and reports the cumulative number of recipients. This filter differs from the

 rcpt-count 

filter rule in that it operates on the message body headers instead of the envelope recipients. The 
following example shows the filter rule used to replace a long list of recipients with the alias, 
“undisclosed-recipients”:

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');

   }

count: if (addr-count("To", "Cc") > 30) {

            strip-header("To");

            strip-header("Cc");

            insert-header("To", "undisclosed-recipients");

           }