When an email is delivered to the recipient, it is up to the inbox provider (e.g., Gmail, Outlook, etc.) to determine where the email is placed. Email service providers, including Klaviyo, do not receive any feedback on where the email was placed. However, reviewing your open rates allows you to get a sense of where your emails landed. If you are seeing low open rates, that indicates that the email was placed in an inbox that has low visibility (e.g., spam/junk).