When sending iMessage, how does recipient know who it's from

When you send a message through iMessage on iPad 2 wifi to an iPhone mobile number, how does the recipient know who the message is from as the iPad 2 wifi has no téléphone number... Does it show thé Apple ID?

Try turning off iMessage and back on again. (Settings> Messages)
This resolved it for me. It is an official apple solution -
http://support.apple.com/kb/TS2755
Best,
Alex

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