This tutorial covers how to delete a single contact and multiple contacts from your address book. You also have the option to remove all data related to a single contact.
It is important to read this full tutorial before deleting contacts. Deleted contacts cannot be restored.
If the contact has requested to be unsubscribed from your email list but has not used the CorpNote unsubscribe form, you can unsubscribe for them. The "unsubscribed" status will prevent you from sending emails to a contact should you accidentally try to add or re-import them into your address book. If the contact later decides to re-subscribe through your CorpNote subscribe form, the "unsubscribed" status will be removed and you will be able to send email to the contact again. (related tutorial: Unsubscribe Requests)