iMessage saying message not delivered but it is going through

Ever since I set up my iMessage on my iPad 2, when ever I send a iMessage from my iPhone 4, the message a) says "not delivered" but it shows up not only in my iPad 2 messages, but to the iPhone I am sending it to, and b) all my messages used to show up under my phone number on my wife's iPhone 4, but once I set up iMessage on my iPad 2 all my iMessages show up under my email address (which is also my apple id).

Is there any way to fix this issue?

I have turned off iMessage on my iPad 2, but that didn't fix any of the issues I have been experiencing.