[checkyoursudo]

If you rely on catchall, doesn't that make it more difficult to eliminate spam from breaches or bad actor companies/services? With aliases and no catchall, I just delete a one-time-use alias and all spam goes away. Can you do something similar even if you are using catchall?

[the8472]

With a catchall you can just setup a filter rule that auto-deletes mails to certain destination addresses and add more to the filter as they get compromised. Which doesn't even happen all that often in my experience.

[newhotelowner]

instead of domain, use subdomain. You can use forwarding service like improvmx to filter out bad actors. Also, forward email to Gmail. Gmail will reject standard spam emails.