You might have noticed when using form fields (text and email) on an iOS device that the first letter is set to uppercase. I find this a little annoying as most email addresses start with a lowercase letter. If you need to, you can override the default setting but using the autocapitalize attribute.
You can turn on or off auto capitalisation.
The HTML markup for an email input field would look something like this:
<input type="email" autocapitalize="off"></input>