AFAIK there is no way to do that unless you write a custom script for that. You'd want to unsubscribe members from all possible subscriptions, deactivate their account and send them a PM explaining what they need to do.
Also: if sendgrid does not differentiate between bounce rules, then you will be deactivating the accounts of users that only had their inbox full for a moment or users that have no problem at all, but their provider sends bounces too quickly.
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