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Client-side POP email filtering

Until very recently, only individuals who ran their own mailservers or had access to a "shell" account to run scripts with were able to use the popular DNS lookup method to filter with SPEWS.

Now there are new methods being provided to people using the Windows® operating system to filter on an individual basis. We refer to one of these methods as client-side POP email filtering. This system looks at the incoming email before your email software does. It checks using various techniques to see if the email is spam. One of the checks used is a DNS lookup of the IP addresses in the email header against DNSBL based lists.

Three software packages that implement DNSBL lookups while POP email filtering are SpamPal, according to its website:

How does SpamPal work? SpamPal sits between your email program and your mailbox, checking your email as you retrieve it. Any email messages that SpamPal considers to be spam will be "tagged" with a special header; you simply configure your email client to filter anything with this header into a separate folder and your spam won't be mixed up with the rest of your email anymore!
SpamEater, according to its website:
SpamEater is an advanced spam filtering tool that will rid your mailbox of spam before you download it with your mail client software! SpamEater Pro uses a complex set of rules to catch even the most persistent spammers with a 90% or better hit rate! With the amount of spam being sent ever increasing, SpamEater Pro is a tool that you can't afford to be without! Don't fret over waiting for your mail to download with all the spam! Get SpamEater Pro and start stopping it today!
And Email Express!, according to its website:
The program is a liason between your email program and your POP3 and SMTP servers. The program becomes your email program's mail server. Email Express! can check an email's header information about its routing servers against an aggregate of RBLs, or Realtime Blackhole Lists. RBLs are special lists that contain information about various points of abuse in the email system used by spammers to inject their spam in to the system, and is updated constantly. If a server in the email headers is found in the RBLs then Email Express! can automatically delete them or sequestor them in to a special Access table. The RBLs are accessed by Email Express! in real time. This process is one of the layers of protection that Email Express! offers its users.
SpamPal, SpamEater and Email Express! are available for use at no charge, SpamEater is available in a shareware "Pro" version with extra features and Email Express! has also added a shareware "Pro" version. SpamPal also has the ability to include other people's "Plugins" as part of it's filtering process.

An "alpha" verison of similar software called SpamProxy is also availible "free for noncommercial use." This software has German language instructions.

Another interesting free POP proxy type system is SAproxy. This software is based on the popular SpamAssassin spam identification engine. This software uses blocklists as well as header & text analysis and collaborative spam signature sytems as part of it's filtering process.

A commercial product, with a free trail, called SARDS is also available and according to its website:
SARDS acts as an E-mail proxy, sitting between your usual mail program and the mailboxes you check. SARDS fetches your E-mail, scans it several ways, and then either passes it on for retrieval by your current E-mail program or drops it into its own trash folder. By doing things this way, SARDS gives you, the Windows user, the power and tools that mail server administrators use to protect entire networks.
Internet blacklist checking. SARDS checks mail senders' addresses against public Internet DND blacklist (DNSBL) servers to see if the sender is a known "spammer," or sender of junk E-mail. SARDS includes twenty public servers, and you can add more to increase the likelihood of catching a persistent "spammer."

We still recommend that all people bothered by spam contact their internet service providers and request they add some sort of filtering to their incoming email systems. Having email filtered or tagged at the ISP side is far more efficient than at the user side. Several spam filtering choices are listed and discussed on the SPEWS FAQ page.

 

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