I can't send iMessages to a specific contact?
The error message says that the contact is not registered with iMessage.
However, I am able to send & receive messages to this contact on my iPhone/iPad. Help? 😕
iMessage-OTHER, OS X Mountain Lion
remember that an iMessage sent to their phone number will only reach them through Message on their iPhone, and not on their Mac or iPad, which can only receive iMessages at email addresses
they also have to be a "subscriber" to messages for the ipad & macs