title: play activator - runtimeException: smtp.host needs to be set in application.conf in order to use this plugin (or set smtp.mock to true)
body: <p>I am trying to run play activator template named "playStartApp".
      But, it is giving me following runtime exception:</p>
  
  <pre><code>RuntimeException: smtp.host needs to be set in application.conf in order to use this plugin (or set smtp.mock to true)\
  
      java.lang.RuntimeException: smtp.host needs to be set in application.conf in order to use this plugin (or set smtp.mock to true)
           com.typesafe.plugin.CommonsMailerPlugin$$anonfun$4.apply(MailerPlugin.scala:329)
           com.typesafe.plugin.CommonsMailerPlugin$$anonfun$4.apply(MailerPlugin.scala:329)
           scala.Option.getOrElse(Option.scala:120)
           com.typesafe.plugin.CommonsMailerPlugin.mailerInstance$lzycompute(MailerPlugin.scala:329)
           com.typesafe.plugin.CommonsMailerPlugin.mailerInstance(MailerPlugin.scala:326)
           com.typesafe.plugin.CommonsMailerPlugin.onStart(MailerPlugin.scala:343)
           play.api.Play$$anonfun$start$1$$anonfun$apply$mcV$sp$1.apply(Play.scala:91)`
  
  
  I tried both:
  - set mail.smtp=mock
  
  - mail.smtp.host=smtp.gmail.com
  mail.smtp.user=yourGmailLogin
  mail.smtp.pass=yourGmailPassword
  mail.smtp.channel=ssl
  
  pls suggest how to resolve this?
  </code></pre>