What information do I need to include in a valid recipient address?
We recommend making sure your address(es) are valid before sending mail. You can read our post "How can I confirm that an address is valid?" for some ideas on how to do this effectively.
The information you need to include is the street address, as well as the corresponding City, State, and Zip.
It does help if you have the recipients name obviously, but it isn't required to send mail.