iMessage problem

[iMore Question]

Good Morning,

How do you register an email address in iMessage, iMessage works between my wife and me on apple products but not to some one else, please help

 

[qbnkelt]

Good Morning,

How do you register an email address in iMessage, iMessage works between my wife and me on apple products but not to some one else, please help

Does the other person have iMessage turned on as well?