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my @mail_to = ($pro_box) ? ( 'person1@mycompany.com',
                                  'person2@mycompany.com', 
...
                                  'person4@mycompany.com') : ( 'person
+2@mycompany.com',
                                                               'person
+3@mycompany.com', 
                                                               'person
+4@mycompany.com');