'In short, you are safe to treat email addresses as case-insensitive.' I'd phrase it stronger: "you're unsafe to treat email-addresses as case-sensitive manner" Especially when checking for …

Jan 26, 2012 · I distinctly remember our email addresses at school being case sensitive. I also remember being careful to write my hotmail account in lower case, not sure if this was just …

Apr 3, 2014 · When authenticating a user, you can optionally do a compare on lower case (or upper case) strings, so that the case is disregarded. So, by preserving the user input data you …

Nov 9, 2016 · I am planning to use Amazon SES to send email. But this page says email addresses are case sensitive. How can it be case sensitive when email providers like Google …

Feb 17, 2009 · RFC 822 and its ancestors state that the local part of email addresses (before the @) is case sensitive. Supporting the populist drive toward case insensitivity adds considerable …

Sep 2, 2022 · The account email is created in lowercase in AD B2C, but from the external IDP, the email claim is in camel casing. (Yes I know the email should be stored in lower case) The …

May 2, 2025 · The domain name is case-insensitive. The local part of an email address could be case-sensitive, but I'm not so sure if any sys-admin would like to support that. Things will …

Nov 3, 2011 · Even though email usernames are case-sensitive by default, according to spec. However, the fact is that despite what I or others might want, this is the state of how things …

Jul 7, 2022 · ID Email 101 [email protected] 101 [email protected] Only ID 101 and its email addresses should be displayed because that's the only ID that has duplicate emails due …

May 26, 2011 · So if you're receiving emails or parsing email headers, then 'no' they are not case sensitive - but if you're sending emails or tweaking email headers, then 'yes' they are case …