In order to protect people's privacy and comply with email marketing regulations, every email sent through DirectIQ gives the recipient the possibility to unsubscribe from that list of emails.
When sending emails for various purposes we might get someone to unsubscribe accidentally and the contact gets disabled, in this case DirectIQ have automated the process and allows you to Ask for Contact reactivation.
To ask for contact reactivation open the disabled contact and then click on the 3 dots on the right > Ask For Reactivation. After clicking ask for reactivation the customer receives an email from DirectIQ where is asked to reactivate the contact as below:
If the customer clicks on Accept then your contact gets reactivated and you will see the contact as Active or Subscribed on the contact view and can send emails again.