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Add New Users
Add new users controls whether blog owners are allowed to create and/or add new users to their blog. The default setting is No.

When changed to Yes your blog administrators will have a Add New Tab added to their menu under Users. This provides the ability for them to create new usernames and add existing users or new users to their blog.
In most circumstances we recommend you keep Add New Users set to Yes.
NB: The Add Users tab provides the ability to batch add 15 users to a blog at a time. To use Add User their username must already be created.
Banned Names
You can ban specific names in WPMU so that no one can register with that username or blog details. By default, WPMU bans www web root admin main invite administrator. Examples of names you might add to banned names include ceo faq support.

Limited Email Registrations
Selecting the “Enabled. Blogs and user accounts can be created” option (Site Admin > Options – Allow new registrations) means anyone can create blogs using your signup page (e.g. http://edutags.net/wp-signup.php).
There are situations where you’ll want to restrict sign ups to specific email domains to limit who registers on your site. You do this by adding domains to the ‘limit email registrations’ section.
Banned Email Domains
Spammers can be a nuisance when you allow anyone can create usernames and blogs using your signup page (e.g. http://edutags.net/wp-signup.php). One way of reducing spammers is to ban email domains that are frequently used by spammers.

For example, banned emails domains on Edublogs include: wilemail.com, 21cn.com, pookmail.com, mailinator.com, disposableinbox.com, recclick.com.
See Next: Welcome email & first post

