How To Bounce A Set Of Email Addresses

I have a catchall for a domain that has been used for years, e.g. vendor1@mydomain.com, vendor2@mydomain.com. Unfortunately, thanks to the fact that maiming spammers is still against the law, I have to live with the fact that the world can no longer have catchall accounts with any usability. One particular jackass is using my domain to spoof numerous idiotic emails. He uses some combo of bulltek*****@mydomain.com. While I am transitioning all of my emails to either 1 account or forward individually each vendor account, how can I bounce emails using that set above?

I'm also looking for something better than spam assassin to prevent email and which will provide more options and a better interface.

Of note, this method of vendor@domain.com worked well because I was able to identify vendors who sold my email address to spam me...