iOS users have been able to block phone numbers and e-mail addresses since the release of iOS 7. When a number or address is blocked, Messages, FaceTime calls, and even regular cellular calls won't ever show up on your iOS device.
When Apple released OS X 10.9.2 earlier this week, it not only patched a security issue, but it also added the ability to block contacts on a Mac for the first time.
Managing blocked contacts on OS X Mavericks is somewhat hidden.
To manage the contacts you currently have blocked, launch the Messages app and go … Read more