Thanks everyone. Just one question. How should I formation the prints to sendmail so that the SMTP envelope sender and bounce to addresses are configured correctly? At the moment I'm just using an open command following by some print statements for the TO: FROM:, etc.

Also do you think I could use POP3 to check the bounce email address? That way the script could be contained and run on any hosting account? Or aren't the pop3 modules included in the core?