Is it possible to do this? If I include the <users who checked in since last success build> in the Notifier Step and someone who does not have an account within QuickBuild submits new code, the build will fail with:

java.lang.RuntimeException: User "micking" not found.
at com.pmease.quickbuild.step.NotifyStep.getCheckinUsers(NotifyStep.java:148)
at com.pmease.quickbuild.step.NotifyStep.run(NotifyStep.java:63)
at com.pmease.quickbuild.step.Step.trigger(Step.java:161)
at com.pmease.quickbuild.step.SerialStep.triggerMembers(SerialStep.java:35)
at com.pmease.quickbuild.step.CompositeStep.run(CompositeStep.java:129)
at com.pmease.quickbuild.step.Step.trigger(Step.java:161)
at com.pmease.quickbuild.model.Configuration.performBuild(Configuration.java:1249)
at com.pmease.quickbuild.model.Configuration.trigger(Configuration.java:978)
at com.pmease.quickbuild.triggeringinstance.ManualTriggeringInstance.execute(ManualTriggeringInstance.java:41)
at com.pmease.quickbuild.model.Queue$BuildRunner.run(Queue.java:221)
at java.lang.Thread.run(Thread.java:534)

Since the account is not recognized by QuickBuild, it breaks. Is there a way to create a default email domain, so that when QuickBuild encounters an account that checked in source code but is not mapped to a user in QuickBuild, QuickBuild will append the default email domain of "@res.developers.com", or whatever default I choose.