Emails are treated as case sensitive

This has led to me creating multiple accounts based on how I happen to type my email address. This is especially confusing as I have to remember the correct way I typed my email when I setup the account in order to get the correct login sent to me. Although https://tools.ietf.org/html/rfc5321#section-2.3.11 states it’s up to the domain to determine how the local-part is interpreted. I would argue that they should follow https://tools.ietf.org/html/rfc1035 and be treated as case insensitive.