Paperless-ngx re-process failed mail consumption? - eviltoast

I’ve been using paperless-ngx to consume mail from outlook/hotmail for a while now, but recently had the mail server refuse connections while mail was being processed. (Not sure why, consuming is working now with no changes and no errors besides ‘connection refused’, while retrieving that mail. Temporary outage I guess?)

This left me with a couple pieces of mail not imported. However, now everytime the mail consume task runs, it recognizes that those pieces of mail are there but refuses to process them with the message:

Skipping mail ‘421’ ‘<email subject>’ from ‘<sender email>’, already processed.

How can I get it to recognize those mails HAVE NOT been processed?