Reviewing Anti-Spam Offerings
Joel Snyder writes "Just finished looking into the innards of 40+ anti-spam products at Network World. The biggest, ugliest, and most comprehensive look at this market that's ever been done. Conclusions: lots of great products to choose from at the top (a dozen or more); a few stinkers in the bunch; and it's basically impossible to review Spam Assassin, which is unfortunate."
RTFA:
We also reached out to the SpamAssassin community (see "What about SpamAssassin?"), but couldn't find someone who could act as a representative for support and configuration assistance. However, two commercial vendors, Roaring Penguin (on Unix) and NoSpamToday! (on Windows) sent products that exposed their SpamAssassin cores.
They have a whole page discussing this.
There are many ways in which spammers harvest and generate spam messages, and not all of them require entering your e-mail address into web forms.
I have a number of e-mail addresses, some of which date back to the early 90's and use daily, and others which are more recent and which I've never used at all.
My oldest e-mail address was my primary e-mail adddress for newsgroup postings for many, many years. I haven't given or used that address in roughly 2 years now (as I'm using a different address that forwards to this old mailbox), and yet I still get dozens of spam messages being sent to this address daily (all of which are thankfully auttomatically filtered).
On the other end of the spectrum is my Gmail account. I have never used this account for anything at all. I've never sent an e-mail from it, or used it to register for anything. And yet it too receives spam (all of which Google also does a good job of filtering automatically). An old e-mail account I got from my ISP when I signed up for my first cable modem was similar -- I already had a mailbox and never used that account. I never even bothered _checking_ it, until one day nearly a year later out of curiousity to see how many spam messages it may have received -- only to find the mailbox was filled with hundreds of spam messages.
I often see messages where the list of recipients was obviously generated by attaching a list of user names to each entry in a list of domains and then sending the results. And who knows how many Windows e-mail worms out there are sending users address book entries back to spammers.
Best practices can reduce your spam load from certain vectors, but not all of them, making some form of filtering good policy. When even unused mailboxes are getting clogged with spam, however, you know that best practices alone just aren't enough.
Yaz.