When attempting to send a message from an iMail group,

I get a message the the outgoing server doesn't recognize any of the recipients, even when I try a couple different email programs.  Any advice?

Your iPad is restricted to using Apple's Messages service for sending messages rather then SMS as per a mobile phone.
As long as you are sending to another iOS 5 and above user then you can send messages on your iPad (as long as you have set it up).
I am afraid you can not text to others not using an iPad/iPod Touch or iPhone

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