SpamBouncer reference:

Purpose:

PreRequisites:

Overview

SpamBouncer is a package that adds spam filtering capabilities to a NetMAX Professional Suite server. It has been tested for suitability on small-to-medium sized installation base. Please note that this package is very CPU intensive, and may not scale well for applications of greater than 50 users. If the SpamBouncer package has a negative impact on the performance of your mailserver, please refer to the SpamBouncer Administration document on how to disable it.

As printed at www.spambouncer.org, the SpamBouncer is a set of procmail recipes, or instructions, which search the headers and text of your incoming email to see if it meets one or more of the following conditions:

• Originates from an email address known to belong to a spammer.
• Originates from known spam source sites, domains or hosts -- internet sites which exist solely or primarily to spam or provide services to spammers.
• Originates from irresponsible, or rogue, Internet Service Providers (ISPs), who permit spamming from their sites and fail to take appropriate action against spammers.
• Was sent using a bulk email program whose only or primary purpose is to send large quantities of junk email.
• Contains headers which match the SpamBouncer's profile of definite or probable spam.
• Contains body text strings which match the SpamBouncer's profile of probable spam.
• Contains body text strings which match the SpamBouncer's profile of a particular virus or class of viruses.

The SpamBouncer sorts suspected spam into three categories -- email sent by a virus, email from known spam sources which is definitely spam, and email which is probably spam, but might also be legitimate. It then tags each email with appropriate headers for the spam classification, and responds according to the parameters you have set. Depending on how you set it up, it will:

• Simply tag the suspected spam and return it to your main incoming mailbox, allowing you to set up Eudora, Pegasus Mail, or another POP mail program to retrieve and sort your mail.
• Tag the suspected spam, delete spam from known spam sources, and file suspected spam in a separate folder.
• Send a simulated MAILER-DAEMON daemon "bounce" to known spammers in hopes that they will think your email address is invalid and remove you from their spam lists.
• Complain to the "upstream providers" of known spammers or spam sites/domains, asking that they disconnect the internet service of the spammers.
• Notify senders of email tagged as probable spam that their email was intercepted, and give them a password to resend their email and bypass spam filtering if their email was legitimate. (Spammers almost never try to bypass filtering when warned this way -- in most cases, they don't even read replies to their mail.)

SpamBouncers default NetMAX configuration will:

• Tag suspected spam and file suspected spam in a separate folder in the targeted user's home directory. Tagging allows you to set up Eudora, Pegasus Mail, or another POP mail or IMAP program to retrieve and further sort your mail.