We're clean. For instance, our ESP detects hard bounces and auto removes them from our lists. We also use Webhooks to update internally on unsubscribes, etc.

We're clean. For instance, our ESP detects hard bounces and auto removes them from our lists. We also use Webhooks to update internally on unsubscribes, etc. For transactional emails, our ESP auto-adds bounces to an outbound block list, so any future attempts to send fail. We only send those to accounts with recent activity anyway, but either way, one bounce stops future sends.