PostCheck is a plugin for Apple's Address Book that provides an efficient, one-click way to lookup missing ZIP+4 Codes, Cities and States and will format addresses to meet USPS standards. Also provides Group Lookups.
- Fixed "US" capitalization in street names.
- Installer is now OS X 10.9 compatible.
- OS X 10.5 or later
- Apple's Address Book
- Works with US addresses only