Reply To: Email address

[cinereus]

Rhys Jones wrote:

Email addresses aren’t case sensitive (neither are URLs for that matter).

This is factually incorrect.

URLs can be case sensitive depending on the webserver software. All levels of the domain (from TLD onwards) are case-insensitive but plenty of URLs are case sensitive.

Because of this the domain part of an email address is always case-insensitive but, as per RFC 5321 2.4, the local part of an email address can be case sensitive.

If someone has advised you otherwise I would worry about their technical competence. And given that knowledge of RFC 1035 section 3.1 and RFC 5321 section 2.4 is very well-known, any developer that thinks email addresses are not case sensitive is unlikely to be technically competent enough to write secure public-facing software.

• This reply was modified 55 years, 4 months ago by .