I'm pretty sure we've got a bug in iPhone's mail app, at least when the phone's language is set to U.S. English. Here's what happens: Start a new email. Then write anything you like and end with a period. Now, immediately after the period (no spaces) enter any capital letter. Then hit backspace. It should just delete that last capital letter. Instead, it goes on a deleting spree erasing everything you've written unless you stop it quickly. To stop it you have to hit shift (up arrow) and it will stop. Can you all please try this and report back? Make sure the letter after the period is a capital. It won't do it if it's lower case. Additionally, what's the best way to file an iPhone bug report with Apple? EDIT. see below in post #4 where I provide an example. btw, I am on firmware build 5A347.