Anti-Spam Toolkit by Paul Wolfe, Charlie Scott, Mike Erwin

By Paul Wolfe, Charlie Scott, Mike Erwin

Each year companies spend billions of greenbacks struggling with the overpowering quantity of junk electronic mail their staff obtain. With the Anti-Spam Toolkit, structures directors have at their fingertips the instruments they should considerably lessen junk e-mail. via real-world software program and examples, the authors display the right way to determine junk mail, install the best-suited anti-spam approach for a enterprise, preserve valid electronic mail from being incorrect for junk mail, adapt and enhance anti-spam structures, and remain one step sooner than spammers. additionally they hide the newest and most well-liked applied sciences available to buy for the proactive structures administrator. The CD-ROM comprises all of the instruments mentioned within the e-book.

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The first, and most likely, separation of function for server administrators is to segregate in-bound versus out-bound e-mail. Segregation of Inbound vs. Outbound Mail Using DNS Separation of mail flows is traditionally done using DNS and by creating an inbound exchanger preference using an MX (or mail exchanger) entry in the name server's zone configuration or database files. Additional backup mail exchangers can also be configured by stipulating several MX entries with a different numeric precedence.

You can also learn a lot about a company before purchasing its products by doing some investigative research. As a quick and incomplete taste of how the company conducts business, we’ve found that by reviewing the “troubleshooting” and “FAQ” areas of a potential vendor’s web site gives you a pretty decent understanding of what problems you’ll likely encounter by purchasing the product. Some vendors also host mailing lists or bulletin boards, where customers can open a general dialog on the operation of their products.

Your server or anti-spam software then looks up the appended name in the DNS. If an actual IP address is returned (again, from the loopback network range), the server exists in the blacklist. Otherwise, it doesn’t exist or the blacklist is down. 5. Again, your mail server or anti-spam software takes the response from the RHSBL and then uses it to decide what to do with the mail. So why have both IP-based and domain-based DNSBLs? IP-based lists typically consist of systems that have sent spam in the past or that are capable of sending spam (such as open relays).

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