I'd go with Jenda's Mail::Sender module, which lets you do something as simple as:

 use Mail::Sender;
 $sender = new Mail::Sender;

$sender->MailFile({to => 'some@address.com',
  subject => 'Here is the file',
  msg => "I'm sending you the list you wanted.",
  file => 'filename.txt'});
[download]