Have an option to ask if you're sure about the recipient list

[AlbertC]

A couple of times I've sent a message to a recipient list which accidentally included a recipient who I didn't mean to send it to (with dire consequences), but I was in too much of a rush and didn't check before clicking 'send'. Would be nice to have the option for a reminder dialogue box to pop up when you press 'send' along the lines of 'Have you checked the recipients list?'. 

[Jon]

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