If you have your own domain email account (i.e. me@mydomain.com, me@mycompany.com) and are continually getting pummeled with spam despite your best efforts, a service you really need to look at is Postini.

Postini is a Google owned service which provides hosted spam protection for ridiculously low pricing (at the time of this writing $12 per email per year). Considering how spam can easily waste 30 minutes to an hour of your time a day, this is a no-brainer. We recently moved our organization’s mail to run through Postini and within a week, my users were already talking about how much time this is saving them.

You can read the full details here, but basically all you have to do is point your DNS mail records to Postini’s servers and the service will filter your mail and deliver only the legit messages. At the end of the day, you will then get a ‘quarantine’ message which asks you what to do with the questionable emails.

Overall, after using this system for a bit, I have nothing but great things to say about it. This is definitely a must have for any organization where spam is a constant complaint.