title: Hudson email ext plugin bug?
body: <p>I am getting an error using my email ext plugin from hudson. 
  I am trying send an email to the following schema:</p>
  
  <pre><code>"&lt; firstName &gt;_&lt; LastName &gt;@&lt; subgroup &gt;.&lt; companyName &gt;.com
  </code></pre>
  
  <p>ex: John_Doe@stacks.stackoverflow.com</p>
  
  <p>I cannot send emails to this address via the email extension plugin. 
  The regular email generator works with this address schema. </p>
  
  <p>I am wondering if the Address Checker module in the plugin is too strict about the address name. </p>
  
  <p>Is there any workaround?</p>
  
  <h1>I get the following spew from Hudson:</h1>
  
  <pre><code>Jun 22, 2009 2:48:53 PM hudson.plugins.emailext.ExtendedEmailPublisher sendMail
  WARNING: Could not send email.
  javax.mail.internet.AddressException: Illegal address in string ``''
      at javax.mail.internet.InternetAddress.(InternetAddress.java:94)
      at hudson.plugins.emailext.ExtendedEmailPublisher.createMail(ExtendedEmailPublisher.java:287)
      at hudson.plugins.emailext.ExtendedEmailPublisher.sendMail(ExtendedEmailPublisher.java:249)
      at hudson.plugins.emailext.ExtendedEmailPublisher._perform(ExtendedEmailPublisher.java:241)
      at hudson.plugins.emailext.ExtendedEmailPublisher.perform(ExtendedEmailPublisher.java:199)
      at hudson.model.AbstractBuild$AbstractRunner.performAllBuildStep(AbstractBuild.java:372)
      at hudson.model.AbstractBuild$AbstractRunner.performAllBuildStep(AbstractBuild.java:360)
      at hudson.model.Build$RunnerImpl.cleanUp(Build.java:188)
      at hudson.model.Run.run(Run.java:962)
      at hudson.model.Build.run(Build.java:112)
      at hudson.model.ResourceController.execute(ResourceController.java:93)
      at hudson.model.Executor.run(Executor.java:119)
  </code></pre>