Send newsletter action - after saving simplenews node
You need to enable the simplenews_rules module which comes packaged with simplenews - this has the action for sending a newsletter defined:

'simplenews_rules_action_send' =&gt; array(
  'label' =&gt; t('Send newsletter'),
  'group' =&gt; t('Simplenews'),
  'parameter' =&gt; array(
    'node' =&gt; array(
      'type' =&gt; 'node',
      'label' =&gt; t('The newsletter node to be sent.'),
      'description' =&gt; t('The newsletter node that should be sent.'),
    )
  )
),