Hello @GeorgeK387 ,
Legally and technically speaking, we don't ever recommend trying to reach out to unsubscribed contacts. If your concern is that contacts are being unsubscribed because they're forwarding emails to other people who then unsubscribe them (keep in mind that these forwardees have to also explicitly confirm the email address being unsubscribed), then you'll likely want to encourage your contacts to not forward your emails. There's other ways they can share your emails, such as via social media or through the View as Webpage link.
For more details on what you can include in your email to make sharing it better, I'd advise going through these articles:
Adding social share options in an email
Add a View as Webpage link to your email
Adding a forward-to-friend button
... View more
