Been 2 days now since using Mailwasher, I bounced that spoof microsoft spam back from whence it came, it hasn't returned, looks like I'm off the list.
I used MW for a couple of years with little impact, if you look at the reply-to addresses that mailwasher uses to bounce stuff, they were either fakes, apparently from myself, or real people who were just on a spam list like me, the bounces were a further waste of email bandwidth.. No spammer is going to give you an email address you can give to another spammer to get your own back!
Worse, they use ASP code on the server to identify you, so using preview or opening an HTML style image will tell them you exist! For them it's just as easy to send to bogus addresses and costs no more to them, why should they bother to take you off the lists anyway?
I used email long before spam was thought of, and my then address was harvested off newsgroups, it's now unusable, gets 100 spams a day. Even solutions like SpamCop do good jobs but you still end up checking through those it's filtered just in case a real message has been detected as spam.
The only solution I found was to buy a whole domain and use rules if spam appears. So when I register on say B&Q's website, I give them the address
BQ@domainname, Tesco might be
Tesco@domainname, so if spam does appear you know who sold your address, and you can use the ISP's control panel to prevent delivery of it.
Sadly once you're on a spammers list the only real answer is a new email address

Never put it as a link in a web page mailto:, never post to newsgroups using it, and regularly check search engines to see if anyone else has posted it by mistake! I have a domain,
knobrot.co.uk, and some joker is using
cockrot@knobrot.co.uk whenever a form asks for email, so I get spam to that now
