switched off header and body checks

switched off header and body checks

PayPal Fraudulent E-mail

A couple of days ago I received an e-mail that turned out to be not only spam, but a fraudulent attempt to rip off my PayPal login information.

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Bayesian filtering

Bayesian filtering is the process of using to Bayesian
statistical methods classify documents into categories.


SpamAssassin is a mature, widely-deployed open source project that serves as a mail filter to identify spam, also known as unsolicited commercial email (UCE). SpamAssassin uses a variety of mechanisms including header and text analysis, Bayesian filtering, DNS blocklists, and collaborative filtering databases. SpamAssassin runs on a server, and filters spam before it reaches your mailbox. Read more at [weblink:49]


SecuritySage security and privacy services can help your organization protect itself from the dangers inherent in networked life. Whether you are a fortune 500, or a small to medium businesses, we will help you to mitigate risks, maximize business objectives, and increase the efficiency of your security environment. Read more at [weblink:48]

Don't We All Love SPAM

I am trying to get a handle on spam we receive in our INBOX every day, hour, minute. I guess the only way to curb spam is to charge for e-mail messages sent.

Since e-mail is free (well, you got to pay for your ISP or so), it doesn't really cost a spammer anything to send out millions of messages. If only a minute subset spam recipients respond, and a subset of those buy a product advertised, than it already pays. If nobody bites, no financial harm done for the spammer, since there is no cost involved in sending messages.

So why not charge for e-mail? The amount should be dynamicaly proportional to the relation of e-mails sent vs. e-mails received. So if you receive a lot of e-mail and send a lot, you can keep it the balance, but as soon as your overproportionatly send more than you receive, you're getting dinged for every message sent. And all this should work with a pre-paid plan. Before you can send, you need to pay. Your account is balanced as long as the ratio between send and receive is balanced.

But since that is not going to happen (or is it? See ABM), I helped myself by deploying the following software:

  • Postfix SecuritySage filter to fight delivery of UCE
  • SpamAssassin with it's rule based heuristic tests and integration of
  • Vipul's Razor, distributed, collaborative, spam detection and filtering network
That has cut down my SPAM about 98%. Yee.

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