I installed a personal email certificate on both my mac mail and iPhone 6. Knowing its a bit different on iOS 8 it took a few extra steps but its installed on my iPhone and is trusted. My question is when sending a signed (not encrypted) from my mac or iPhone to a recipient using iOS it does not show a signed blue check mark in the From header. It is my understanding that a trusted certificate would be recognized on the receiving end. Maybe someone can explain this. Does the recipient have to have their own certificate installed? On mac mail any message that's signed shows as Security: emailaddress with check mark.