I use fastmail masked email (which is basically the same thing) with the firefox plugin. I love it.

It gets better when you have your own domain and you can register with throwaways using spamco@mydomain.

I've started doing this about a year ago, but I haven't nailed down an easy way to blacklist addresses from my catch-all. Do you know of a painless way to do that?

Don't use a catch-all. List specific allowed addresses, and remove them (after reporting) if they become spam sources.

In fastmail, rules for specific addresses take priority over catchalls. So if I have a catchall and tell it to bounce emails to spamco@, the bounce rule applies properly.

I share my domain with my parents, so I use [email protected]_domain.tld instead, whereas XXX is replaced by the service I sub to. That gets routed to my inbox and I have some server rules that sort them in sub-dirs.

For more shady stuff I have some throwaway mail at some free mail provider.

What is the add on name?

What do you do about accounts where you need to log in on different devices? This is where I end up leaving it at the door.