You may get away with adding a Content-Type: text/html header to the mail message but I would suggest that probably the easiest way of doing this is to use the module MIME::Lite - this can be as easy as:

use MIME::Lite;
                                                                      
+          
my $msg = MIME::Lite->new(
                           From     =>'jns@localhost',
                           To       =>'jonathan@localhost',
                           Subject  =>'Test',
                           Type     =>'text/html',
                           Data     =>'<h1>THis is a test</h1>');
$msg->send();
[download]

Of course you would need to add the extra code to loop through the list.

/J\