I also second this feature. It would be nice to know which emails are now dropped and why (soft bounce, hard bounce etc). Maybe a notification to the admin or something in the logs to check.
I’m trying to hard to figure out if email which bounce have been blocked by discourse or not?
For example if I see this in the logs
Email can not be processed: Email::Receiver::BouncedEmailError
How do I know if discourse will continue sending or no longer send emails to that address?