Horizontal scroll bar on To: in email?

I'm entering email addresses in the To: box. After I add so many, a horizontal scroll bar appears and I can't see what I'm entering. Yes, I want all those addresses there. I don't want to do a BCC. How can I get the bar to go away?|||Scroll down in the box and you'll see the last items entered. You can't get it to go away unless you send one email to a few people and go back and send it again and again until you've sent to everyone.|||it would be soooo much easier if you just put all of your adresses in your adress book and the just checked them and pressed 'insert checked contacts' this way, the computer does it all for you!