When the recipients of my mailing try to click on the "Unsubscribe" link the user is taken to a generic/undefined page that reads: "CiviCRM Do not delete this page. Page content is generated by CiviCRM." The user is also not marked as having opted-out of all bulk mailings.
The link generated is generated via {action.optOutUrl} which yields "http://besanthill.nfshost.com/civicrm?page=CiviCRM&q=civicrm%2Fmailing%2Foptout&reset=1&jid=244&qid=7847&h=0db2c5d63683bd63", for example.
I've looked at the suggestions on this post but the CMS base page and the permissions appear to be set correctly (that is, "access CiviMail subscribe/unsubscribe pages" is enabled for anonymous.) And ideas?
Thanks in advance, Richard