[How To] redirect a file to another url

[Scott]

This seems simple enough however, when I apply the redirect and then test it, I keep getting a 404.

Here is a list of the current redirect:
/pubs/newsletters/newsletter-sign-up-allmar-technologies.php >> http://www.allmartech.com/lists/index.php?p%3Dsubscribe

Any suggestions would be helpful.
Thanks