I don't believe I ever mentioned portability. The purpose for not using CPAN modules is that they can be bothersome at best to install, particularily if one a) doesn't have root access, b) doesn't particularily care much either way about the programming language the app was created in. Like I said, I'd personally much rather use a mod and save myself the trouble, but I do not believe it is appropriate for this script. It's an install, set config vars, and run kinda deal. The link mail func is just a perk, if they happen to have sendmail useable, then hey, more power to em. If not, well it doesn't really matter.
-Syn0