wt/examples/hangman/wt_config.xml

<server>
    <application-settings location="*">
	<properties>

	    <!-- You need to register at google for this to work, and enter
                 there the same values as you do here. -->
            <!--
	    <property name="google-oauth2-redirect-endpoint">
		http://localhost:8080/oauth2callback
	    </property>
	    <property name="google-oauth2-client-id">
		00000000000.apps.googleusercontent.com
	    </property>
	    <property name="google-oauth2-client-secret">
		abcdefghijk-123456789xyz
	    </property>
            -->

	    <!-- These configure the email address used to send emails
	      -->
	    <property name="auth-mail-sender-name">
	      Wt Hangman Example
	    </property>
	    <property name="auth-mail-sender-address">
	      noreply-hangman@www.webtoolkit.eu
	    </property>
	</properties>
	<progressive-bootstrap>true</progressive-bootstrap>
    </application-settings>
</server>