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.
Note: Now requires OS X 10.9 or later running on a 64-bit Intel processor
- New Gatekeeper-compatible installer app, rather than a simple command-line tool
- Now distributed on a macOS 10.12 Sierra-compatible signed disk image, rather than a ZIP file; required because of Gatekeeper's new Path Randomization security feature
- Worked around a bug in
- OS X 10.5 or later
- Apple's Address Book
- Works with US addresses only