[TRI-2630] Logging in with the same email but different case creates a new account

[matt-aitken]

If you login with [email protected] and [email protected] you will create two accounts.

_{From SyncLinear.com | TRI-2630}

[hunxjunedo]

@matt-aitken kindly assign this issue to me, would like to contribute.

[matt-aitken]

[email protected] and [email protected] can be treated as equivalent because DNS specifies that domain names are to be compared in a case-insensitive manner. But the same is not true for the user/mailbox part of an address, that should actually be case sensitive so we should create multiple accounts for those.

[matt-aitken]

• [ ] [email protected] and [email protected] should be the same account.
• [ ] [email protected] and [email protected] should be different accounts.

[matt-aitken]

@hunxjunedo I've assigned this to you 👍

I've also added some more comments above about what exactly should cause a duplicate and what shouldn't