Billing and history
Deleting contacts deleting means you lose all history and reports that include deleted contacts won't be accurate anymore.
Also, keep in mind that invalid and unsubscribed contacts don't count towards your total contact count and as such they aren't used for billing.
Deleted vs. unsubscribed
Instead of deleting contacts we recommend that you to mark them with "revoked" consent state. That way history is kept and the contact will not receive any emails going forward. Read more: how to bulk unsubscribe contacts
How to delete contacts?
To prevent accidental deletion of a large number of contacts you can only delete contacts that are shown on single page, for example 25 or 50 at a time. To do this, follow the instructions on the "how to bulk edit contacts" article.
To delete more contacts:
Mark the contacts you want to delete with an internal list (here's how to add existing contacts to a list).
Contact support via chat and let us know the name of the list that includes the contacts to be deleted along with the number of contacts on the list.
We will delete the contacts for you.
You can delete the internal list that was used to mark the contacts to be deleted.
Some contacts cannot be deleted
Contacts with consent status "revoked" or "spam reported" cannot be deleted. This restriction is in place to prevent these contacts from being accidentally re-added to the database as subscribed contacts, which could create spam complaints and compliance issues.