It's not always a problem, but having mixed case email addresses in records can be a hassle at times when processing; export, apply lower() function, sort, test for duplication is one problem, also sight detection of duplication is another. In the same way that we have options to present phone numbers with paren's (###) ###-#### or just dashes ###-###-####, etc., maybe it wouldn't be too difficult to add options for email. ALL CAPS or all lower. Speaking of options, it's always bugged me that international numbers don't have a formatting option. I know they are difficult to standardize, but I have a considerable amount of numbers that aren't USA+Canada.