Can't use iMessage on my mac air with certain phone numbers

I've seen other postings about this topic but haven't found any resolution. I am able to use imessage for certain contacts/phone numbers from my mac air but others I can't seem to get to work. The message is -- Your message could not be sent -- xxx-xxx-xxxx is not registered with imessage. I am able to contact these numbers from my iphone but not from imessage on my Air.
If anyone has a solution please let me know.
Thanks!
HRR

Then they're probably not iPhone numbers. If your messages to those numbers are appearing in green on your phone, they're non-iPhone numbers and you can only communicate with them through regular SMS texting. Your Air cannot text in this way.
Matt

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