Announcement List Question


I have set up and announcement list and would like to make it easy for users to unsubscribe by clicking on a link at the bottom of every email I send to the list. I currently have a link in the email that sends them to my unsubscribe page on my website but they then have to reenter their email address and click on the button to unsubscribe.

Is there anyway for me to automatically fill in their email address on this form? Alternatively can I make the email link just send an unsubscribe command directly to the mailing list?

Thanks for any help!