Cannot authenticate on LDAP with an email that has the same domain as LDAP

[Murazaki]

If your user email is : test@example.com
his uid is : testuser
And your ldap domain is : dc=example,dc=com

the LDAP authentication strips the domain from the email, rendering your user unable to authenticate with the email.

Solution :
You should not overwrite the username provided rather than add another username case in the case that the user should be able to authenticate with its email handle.
This option should be selectable.

[figureone]

This was a legacy feature for supporting LDAP and CAS servers that didn't provide a user email attribute, see details here: 90815fa

I agree this seems like it should be removed, but we'll need to make sure we don't break compatibility with any folks running nonstandard setups. Perhaps we can add an option to Authorizer Settings to toggle this behavior.