How are we charged for parked domains?

When our system detects activity related to sending DMARC-compliant emails from a domain you've set as a parked domain, it will automatically change the domain type to "sending". This change may require additional payment, depending on your plan.
The domain type can be changed back to parked if there are no DMARC compliant reports within the previous 30 days.

However, please note that you can have unlimited parked domains in your account, as long as they remain inactive and do not turn into sending domains.