How to progress messages stuck in the wf_notification_in queue

Messages are 'PROCESSED' state in wf_notification_out queue.  They are in  'READY' in the WF_NOTIFICATION_IN queue.  Messages can be processed from the worklist. They are not working from email.

All wf messages, even alerts are affected. I sent a test message from the workflow OAM page.  It came to my email box. I 'acknowledged' it. The message went to the mailers inbox, then  processed folder. It status was "Open" mail_status 'SENT'.    I clicked the message in my worklist. It 'closed' it.

There are more messages than I can count in this state.

This started with an internet outage.  An Exchange was affected.   We use exchange for smtp mail and imap for dovecot for imap email.   I was not told of the internet/email outage last week. Only that workflow was not working.