I'm trying to send an iMessage to someone who has an iPad on IOS 6.0 and that I know the email they use for iMessaging. If I manually send a message by picking the email as the send to address it works fine. If I have Siri send the iMessage she picks the mobile phone number as the send to address and the message fails. Is there any way to force Siri to send the iMessage to the email address and not the mobile phone number? Thanks for your help.