If I use the email address "[email protected]" then it doesn't work but if I try [email protected] then it works.
I've tried this from How to open mail app from Swift
let url = NSURL(string: "[email protected]")
UIApplication.sharedApplication().openURL(url!)
and this
let url = NSURL(string: "[email protected]".stringByAddingPercentEscapesUsingEncoding(NSUTF8StringEncoding)!)
UIApplication.sharedApplication().openURL(url!)