If an user has unsubscribed or your defaults are set to false, you can subscribe an email address by the following methods:
Send us the email address of the user who subscribed, along with the isSubscribed and isSubscribedAlerts set to true.
window._vteq = window._vteq || ;
email: "[email protected]",
2. From server, through API
Update the user with the same attributes, isSubscribed and isSubscribedAlerts set to true.
Here’s more information.
3. Manually from the dashboard
Go to Users->Users, search for the user’s email address, click find and then click on it. In the popup that appears you can set the values for isSubscribed and isSubscribedAlerts from the list.