Why do IMessage not delivered?
Some iMessages are not delivered and I need to resend. Why does this happen?
iPod touch (5th generation), iOS 6.1.4
Bernie ~ One possibility is that the iMessage system has a temporary "issue". See its status here:
http://www.apple.com/support/systemstatus/
And you may find more explanations in the More Like This section to the right of this thread.