On most installs, the administrator forces the user to login with their WikiName

There is also the means to pick and use an arbitrary login name.

Some users don't remember which they used.

As long as the LoginName, WikiName and email addresses are distinct and the password is correct, it would ease the user's experience if they could log in with any of their addresses.

-- MC

This is an Enhancement

CC

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Also need a mechanism to handle the current one to many relationship between wikinames and e-mails to realize this.

-- SP

This needs to be configurable, up to the site admin to decide if login by wikiname only or also by other means.

-- PTh