Email Sending issue Problem with email

I want to send email to my users but my server support only 500 email per hours so i want to send email in piece, But there is not setting at your server for 2 condition.

I want UserId>500 and UserId<1000 . In that way it will select users in range, How will i do that.

For your reference. http://s14.postimage.org/5goq5e79r/Untitled.png

Thanks

Arent you better off setting the "Use E-Mail Throttle Queue" and setting it to 400 an hour?

David