headtime: take one domain (you have one :-), and create two mailboxes. Call one "junk" and the other one is your own mailbox. Now point the default alias, ie. anything not matched before the @, to point to your mailbox. Now give every organisation, company and website their own address at your domain, for example
[email protected]. Now, if that address begins to receive spam, you can not only cut it off by directing it to the "junk" mailbox, but you know which unscrupulous company sold your address in the first place.