delete sent item

Using Outlook 2003, I have set up a rule which forwards all of my email to a
web-based email account. This allows me to have access to my home email from
work and it works very well. The problem is that I then have hundreds of
"sent items" going to my web-based email account.
Is there any way to either not save a copy in "sent items" or to set up an
additional rule which will automatically delete all of these forwarded emails
from the "sent items" folder?

Thanks