Is the server Unix/Linux? Do you have shell access? If your provider lets you, you _should_ be able to set procmail up to do that for you, pretty easily too.
If you aren't careful, you might get a lot of spam, tho. If you take any @richardfidler.com address, that is. If you have a specific list, it's super-easy to have procmail do that for you.
You may not even need procmail - you might be able to set up a .forward file.