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Is there a difference in writing e-mail with large or small letters?

There are certain rules of the task (writing) e-mail address. It needs to be: login dog domain (login@domain – f&w@ etc.). The main requirement is that the username is unique in the domain and can use only letters, numbers and symbols. If the job he was not unique, the system will report this. To change the whole login is not required, you can add icons, symbols, or Vice versa, something clean. But at the expense of what should be the first letter system does not object. Personally, I have for several years, the username starting with a lowercase (small) letters. Just as "uncomfortable", if the username is the name or surname in Latin transcription, and written in small letters
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