Here is a list of things you can do to help prevent receiving spam in the first place:
- Do not use a catchall email account on your domain(s). Only list aliases and POP accounts that you actually use. This stops the frequent spams that fire off emails to a list of names on a domain.
- Never, ever, click on any links in any spam - especially not to "unsubscribe". All this does is confirm to the spammer that they have a "live" address.
- Configure your client to read any incoming emails in plain-text, never html. Html spam emails contain links to graphics and scripts on spammers sites, confirming your email address.