@Override
    public void setEmail(String username, String email) throws UserNotFoundException {
        throw new UnsupportedOperationException();
    }
A UserProvider to be used in conjunction with
{@link org.jivesoftware.openfire.auth.POP3AuthProvider POP3AuthProvider}, which
authenticates using a POP3 server. New user accounts will automatically be created
as needed (upon successful initial authentication) and are subsequently treated as
read-only (for the most part). To enable this provider, edit the XML config file
and set:

<pre>
&lt;provider&gt;
    &lt;auth&gt;
        &lt;className&gt;org.jivesoftware.openfire.auth.POP3AuthProvider&lt;/className&gt;
    &lt;/auth&gt;
    &lt;user&gt;
        &lt;className&gt;org.jivesoftware.openfire.user.POP3UserProvider&lt;/className&gt;
    &lt;/user&gt;
&lt;/provider&gt;
</pre>

@see org.jivesoftware.openfire.auth.POP3AuthProvider POP3AuthProvider
@author Sean Meiners
xmppserver/src/main/java/org/jivesoftware/openfire/user/POP3UserProvider.java