Some email addresses and web page addresses are printed in flyers, business cards and other advertising materials with some capital letters. But do you need to use capitals when typing in an email address or web page address?
Email: Everything up to and including the .com (or .org or .net) part of the web address is never case sensistive. It doesn't matter what has been printed or what you type in, they will always work. So if someone gives their email address as ABJones@MyMail.com you can safely type it in as abjones@mymail.com .
Web pages. Like email, everything up to and including the .com (or .org or .net) is never case sensitive so www.example.com,
WWW.EXAMPLE.COM or www.Example.com will all work. BUT any text after the .com might be case sensitive (e.g. www.example.com/FAQ.htm) and needs to be typed in as referenced.
For more details, see this helpful article.
