Email Registration
Allow users to register using only an email address, ie. without username. The user, once registered then may log-in using their email address and password for authentication.
A username is generated and assigned based on the user name part of the email address. Subsequent users who have the same name (email prefix) are numbered sequentially. For example, "johndoe@exampleA.com" would be assigned username "johndoe", "johndoe@exampleB.com" would be assigned "johndoe001" and so forth.
Username is the displayed name for posts, comments, etc and may be made changeable if so desired.
(Administer -> User Management -> Access Control) ... [X] change own username
This privilege allows a user to change their username in "My Account".
Note:
You will probably want to change the welcome e-mail (Administer -> User Management -> User Settings) and replace instances of the token !username with !mailto
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