I know this is not legal and ideally we should not send any email to this audience but still I wanted to understand the different ways.
CASE: Natural calamity is spreading in the city and you want to send an email to everyone about the precautions. How we can make it possible?
The local laws should apply.
But if you did want to bypass Unsubscribe, you can mark the Email Asset as Operational. This is in the docs.
You need to know that most regulations provision some possibilities to send emails when personal safety is at stake. This one of the conditions you would find in the GDPR.