My Drupal installation attempts to send emails to a number of users whenever I create or update content but do not publish it. But because sending email is not configured errors are generated.
I don't know what configuration item I could have deliberately or accidentally set to cause that. Is there any setting or module that could cause that?
I don't think I have configured any Rules or Workflow settings to send emails, and it only occurs when the item is unpublished
->mail(
method. Drupal shouldn't send out too many e-mails. So this might also bring you a little closer to the source of the sent mails.