PostCheck adds additional functionality to Apple’s Address Book. With one click, PostCheck will fill in missing parts of your addresses, such as ZIP+4 Codes, as well as format your addresses to conform to USPS standards.
Whether you manage a mailing list, send clients invoices, or just like a neatly organized address book… PostCheck can save you a lot of time and help the Post Office get your mail to it’s destination quicker.
Read more about the benefits of PostCheck and download the demo on the [PostCheck website](http://briantoth.com/postcheck/).