According to http://www.fanmail.biz/1566.html, you can send fan mail to the Cubs at:
[Player Name]
1060 West Addison
Chicago, IL 60613-4397 "How to send your fan mail and autograph requests to the Chicago Cubs?: If you want to request an autograph, follow the guidelines bellow. If you just want to mail a letter with the address above, and do not want anything back, then you can stop reading! If you live in USA send a properly stamped and self addressed envelope (minimum size 8.5" x 4") with your request letter and a photo. You can include a piece of cardboard to keep the photo from bending in shipping and also add "Do Not Bend" on the envelopes. Send your letter and wait. On average, there is going to be a 3+ month wait for a response."
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