Actually, Listia asks that you store shipping information on your account, instead emailing the info: All users must store address(es) in their Shipping Address section, located here. A saved shipping address field is the only means through which a buyer should share his or her personal information with the seller. As a buyer, you can store one or more addresses and reuse them to tell sellers where you'd like your items shipped. So instead of pasting (or re-typing) your address in a message every time you win an item, you'll simply choose one of your pre-entered addresses, eliminating typos and saving time! An additional benefit is that we standardize abbreviations, correct misspellings, and add in zip codes, to minimize shipping errors.
While messages can still be used for general communication between buyer and seller, they should not be used for sharing shipping information. This keeps down confusion.