I really don't understand why people just don't turn off their mailservers if they don't want mail from others.
Most of us have come close. I get north of 500 spams a day unprotected. I've been using the same email since '01. I know many others have it worse than I do.
I got my first website address in 1997. I almost got bob.com, but networksolutions would not give it to me even though it was expired for a year. Microsoft legal even offered to network solutions to let it go..but they would not send the fax. It should have been mine. I spent a week calling about it to microsoft and left a message to a 'top guy'. The next day it was suddendly given to the guy who owns it now. A 'friend' of microsofts.
Anyway...back on the topic. My email has been the same forever. On the old server I could, after filtering, get upwards of 2000 mails a day. Not all junk mail is filterable due to work and stuff.
I just did my centos though..new server, updated the spam stuff...down to less than 100 a day. It is like being reborn.
So, it is possible with a heavliy used email address to weed out a lot of junk through centos and spam assassin indeed. I was highly impressed.