There are two methods of resubscribing a contact:

Method #1 - Web Form

Add the contact via a Web Form that you can create with the help of Elastic Email (learn more here). 

Method #2 - Subscription link

Go to your Elastic Email account's Settings "Unsubscribe" tab. Here you will find a "Subscription link" that you can copy and forward to your contact outside of Elastic Email. Once clicked, the user will be forwarded to a default subscription form.

With both methods, after the contact is added, they will be sent an email with an activation link - when the link is clicked, the contact's status will change back to "Active".

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