Thanks for reaching out to the community. I’d be glad to help you!
To stop a contact from getting any further autoresponder emails within a series, just remove the contact from the list(s) associated with that autoresponder series. It will still show as “queued” as those are listed separately, but when the next email is actually sent, it will not find that particular contact in the list to send to so they will not get it. As with all of our outgoing campaigns, it does not go get the contacts in the list attached to it until it is in the process of sending. Here is an article on removing contacts from email lists.