Been following this thread for a while now and never really had anything to add before.
I've used a number of services (including Emailias and SpamGourmet) to protect my privacy and inhibit spam. The one I've been using lately is called
Bulc Club (
www.bulc.club). It's entirely free, has unlimited forwarders, and uses Member Rating for mail filtering -- which operates kinda like Facebook's "Like" button, but blocks messages and increases the spam score instead.
I haven't really explored much of the advanced features since I never really log-in. I think you can block emails individually by sender address, and also block whole mailserver domains. They have plugins for Chrome and Firefox and allow you to create disposable, single-use emails too, but I haven't used those.
Hope this helps someone.