Notifiers can be attached to a Maven project by adding them to the pom in the ciManagement section.
<ciManagement>
<system>continuum</system>
<url>http://127.0.0.1:8080/continuum</url>
<notifiers>
<notifier>
<type>mail</type>
<sendOnError>true</sendOnError>
<sendOnFailure>true</sendOnFailure>
<sendOnSuccess>false</sendOnSuccess>
<sendOnWarning>false</sendOnWarning>
<configuration>
<address>continuum@127.0.0.1</address>
</configuration>
</notifier>
</notifiers>
</ciManagement>
Or they can be added to a Project Group with the Notifiers link:

Or to a project with the Add button on the Edit Project page:

Here you select between Notifier implementations provided with Continuum:

You have the following choices: