I have been running a similar service for myself on my own exim mailserver for a couple of years now and very happy with it. Provided explanation on how to achieve this on my blog https://www.guidodiepen.nl/2013/02/catch-almost-all-in-exim-... Whenever an address is receiving too much spam, I just blacklist it at the server level, ensuring I don't have to filter it anymore in my mail client since the server won't even accept it.

Have to say that it is always funny when a person asks for my email address and it confuses them when the address part before the @ sign contains their company name :) Often get the question whether I also work at the company or so.