Tying into the previous point, the above mentioned RFC 5321 recommends for new email addresses to be created with lower case letters only to avoid potential confusion and delivery problems. That being said, you should check the rules of the email provider with which you want to create an email. All major providers, such as Gmail, Yahoo Mail, Hotmail, and others, treat the local parts of email addresses as case insensitive. While email addresses are only partially case-sensitive, it is generally safe to think of them as case insensitive. In practical use,, , and are the same email address. This means that you can write it in lower case, upper case, or any combination of the two and your email will end up at the same address. Therefore, many providers treat the local part of the email address as case insensitive.Īs for the domain part, RFC 1035 stipulates that it is always case insensitive. It is easy to see how this could create problems and diminish user experience if a mail server opted to treat the local parts as case sensitive. This means that, in theory, is not the same as However, email providers have the liberty to treat the local parts as both case sensitive and case insensitive.įor example,, , and are theoretically different email addresses.
According to RFC 5321, the local part of the email address is case sensitive. The correct answer to this question is both yes and no.
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