Hello @user520395 ,
If a contact has been marked as unsubscribed from you, you'll need to go through the resubscription process. However the easiest method for a contact to resubscribe to you would be for them to go through one of your sign up forms, either a landing page form or one coded into your website.
If they’re unable to get signed back up through a sign up form or through the resub email, you can request our Review team do a manual override of the unsubscription. You’ll need to get an email directly from the contact explicitly stating they want to be resubscribed. Then you’ll need to call into the Review team, and follow their processes from there.
Since there are a number of legal and Compliance-related elements to unsubscribing and resubscribing, we have to make sure one of these three processes is followed.
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Here are some general best practices for delivery.
Delivery can have a lot of variables, from elements on our side, on your side, on the recipient's side, and in their email system company's side. It's typically best to set up additional authentication for your emails, such as self-authentication if you have your own domain.
If you'd like to learn more about safelisting, and what it entails:
Safelisting domains in a security system
Safelisting email addresses in an email client or security system
If you're wanting more in-depth, specialized insight on your current deliverability, it'd be worth speaking with one of our Delivery agents.
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