Sometimes your contacts mistakenly remove themselves from your contact list. But to go back, they have to confirm it, according to the Spam Act.
We have streamlined processes for you – send them an automatic email where they can confirm their return to the contact list. How do you do that?

Sending an email asking to be added back to the contact list

How to send  an automatic email for Re-subscribe

Log in to the tab of the contact who would like to return to your contact list.
Click on “Send an email requesting a return to the contact list,” and confirm sending the email.
The contact will receive an email in which they can confirm receipt of mailing from you and return to your contact list.
Once they confirm this, they will immediately return to your list of approved email contacts.