Whether when selecting a from email address in CiviMail (or Civi regular email), or selecting (the email of) an existing user in Drupal Webform_CiviCRM, the email will sometimes be hidden and the message "email protected" will be displayed instead. It seems to happen only when I access the site with a https URL. When I access the site using http, I can see the email. This has been the case on all Civi versions with Drupal 7. Same thing when logged in as user 1
What causes this and how do we get rid of it?