Q: Why has installing IOS8.4 stopped my iphone 6 and ipad mini from sending (not receiving) emails

Hi ChrisandElsa,

Welcome to the Apple Support Communities!

I understand that after the most recent iOS update, you are unable to send mail from both your iPhone and iPad. In this situation, I would recommend reading over and working through the suggested steps in the attached article below. 

Get help with Mail on iPhone, iPad, and iPod touch - Apple Support

Best regards,

Joe