In the Messages Beta on my Mac, I can see the email address that my contacts use for iMessage and I can, therefore, send a message which will sync with iMessage on my iPhone.
I am confused, however, about how I make this happen in the opposite direction: I don't seem to be able to address a message to an email address on the iPhone (only the contact's phone numbers show up). Although sending a message to the phone number goes via iMessage instead of SMS conversations initiated on the iPhone do not sync to the Messages Beta.
Am I missing something obvious here?
Pro, Mac OS X (10.7.3), 13" Late 2011 8GB RAM