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Here is another "how-to" so you have options! http://ios.wonderhowto.com/how-to/trick-emailing-more-than-five-photos-once-ios-7-plus-better-way-do-it-0148887/
Hi, I know it's a really annoying feature of iOS 7. But you can send more than 5 images (as many as you want) with a free app called Kicksend. This Cnet howto might interest you: http://howto.cnet.com/8301-11310_39-57605499-285/how-to-e-mail-more-than-five-photos-at-once-in-ios-7/