Hi there @Bookman AB, 

Welcome to the Community! 

If I am understanding correctly, are you asking about when a customer goes through a Flow? What is the “position” that a contact is going through and what makes it not valid? If you are looking to understand how contacts move through a flow, I recommend our documentation here. 

If you are looking to unsubscribe customers to no longer email them, here are some related documents:

Guide to Unsubscribes in Klaviyo

How to Add Unsubscribe Links

I look forward to your response,

Alex

Hi, 

I mean if we send a campaign/newsletter to a list and we receives autoreplies that some subscribers have ended there position and the email is no longer valid anymore. Will those contacts automatically gets updated - and not receive anymore emails or do we need to delete them?

thank you!

Hi @Bookman AB,

Thanks for the clarification. If a customer unsubscribes from a mailing newsletter or campaign, then they will automatically be marked as a suppressed profile and no longer receive email.

Here is a guide going into further detail about these profiles and how they work. Additionally, I would recommend checking out our Guide to List Cleaning for when you want to remove profiles.

Thanks!
Alex