Hi @KristiS4 ,
This is a great question. At this time, we do not have the ability to remove contacts who have already been present in the list for certain Automation triggers without doing it manually. For example, if you are using the "when a contact opens an email" or "when a contact clicks a link" trigger in the Automation platform, the contacts will receive the rest of the emails in the series if they open the email or click on the link, regardless of whether they have been a part of the list previously.
However, if you are using an automated Welcome email, it will not be sent to anyone who has been in your contacts list previously. Similarly, the Automation trigger "When a contact joins a list" will only send out to the contact the first time they join that specific list. So if they were previously part of that list, they will not receive the series unless you opt for them to.
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