Spam Filtering Service

• Spam filtering services offered by many retail isps, commercial online spam-filtering services (such as spamcop), mda-based procmail scripts, or packages like spamassassin, are all examples of on-network filtering.
• Spammers often relay spam through third-party systems in order to hide the point of origin to trick users into reading messages they would otherwise delete, to evade automated spam-filtering software, and to make it difficult to complain about spam.
• Spam is often detected by common traits.
• Spammers continue to find open paths to unsuspecting inboxes, with the added risk of virus-infected messages a growing concern among consumers.
• Mailback scripts can be used by website proprietors to get feedback from visitors without exposing an e-mail address to spambots, but misconfigured mailback scripts can also be exploited by spammers to send spam untraceably.
• Pink contract: an undisclosed agreement between an ISP and a known spammer.
• A pink contract will allow the spammer to send bulk email through open relays on their servers.
• False positives (a non-spam e-mail message that is falsely tagged as a spam message by a spam filter) can be more worrisome than false negatives because they might represent important personal communications that the recipient might never see unless he carefully examines the messages trapped by his filter.
• Spam emails are a constant threat to anyone using e-mail as a form of communication, regardless of which email program is being used, so downloading a spam blocker for microsoft outlook becomes all the more significant.
• Much of the spam sent to worldwide email addresses is meant to introduce products, in the hopes that the receiver will be enticed to buy.
• Spam wasn't a problem in the early days of the web, we allowed it to become a problem by accepting the problem.
• Spam is one of the threats that we faced when we're using the internet.
• Challenge-Response is a spam-prevention system in which the first email contact from an unknown sender is bounced back with a "prove this is really you" message.

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