Select Code to Download

to
    => the recipient's address(es)
          This parameter may be either a comma separated list of email
+ addresses or a reference to a list of addresses.

to => join(',',@rd_list);

@rd_list= ('a@b.com','b@b.com', 'c@c.com');

...
    'subject', 'Test',
    'msg', "All,
  ...