Is there any tool available to automate iOS default (Email) app?
I have explored couple of tools like Appium, KIF: for these tools we need to own the app (to enable Automation Instrument) to automate. And also tried with .IPA files available on the internet (Gmail email client) on iOS simulator, not got any success yet.
I have a requirement to automate iOS' default Email app, is there any tool/approach to do this?
Your can give xcode(iOS emulator) a try and try to write a script to execute the emulator automatically.
Addendum: I do not have a hands on experience of it but once you have your app/website running in xcode emulator you can write test scripts using the IPhoneDriver plugin of selenium webdriver and run your tests!
I suppose this link below can give you some idea of using iPhone driver - seleniumhq.wordpress.com/2013/12/24/android-and-ios-support