Using CiviCRM generated URLs in the mandatory footer of a Civimail bulk mailing users are presented with error: CiviCRM You do not have permission to access this content.
The url form is: https://example.org.uk/civicrm/?civiwp=CiviCRM&q=civicrm%252Fmailing%252Funsubscribe&reset=1&jid=8909&qid=254938&h=7be20f8b9c9c9389
Why are users being denied access?