How can I stop getting the email sent to me?

Back when I had WIN ME and O.E. 6, I could set up a group send whereby I had
another name associated with my ISP email address in the To: line to be
deleted at server. This way I could send BCCs and not receive it back to me
(as I already knew what I sent, lol).

However, now that I have WIN XP Pro, no matter whether I had I.E. 6 or now
7, with the O.E. 6, I keep getting a copy of the email when I send it out. My
ISP requires an address in the To: line.

So, how can I set up a rule when I send out a group send so that I do not
get a copy sent back to me? Or is this just part of XP's security and live
with it?

Thanks,
Joan