We're wandering away from Perl here, but nevertheless: you can check the mailqueue on the smtp server (if you have access to it) with the mailq command. It gives you a list of stuff that's waiting to be sent, with an explanation as to why it was not sent, if applicable.

If your mail does not show up, check the mailer logs (somewhere in /var/adm or /var/log, depending on your Unix version). If your mail does not show up there, it never got to the server.

If your mail server is on a Windows machine, people more knowledgeable about that than me will provide you with the equivalent commands and log files to check this (I hope ;) ).

CU
Robartes-