email spam virus

E-mail spam is a subset of spam that involves sending nearly identical messages to thousands (or millions) of recipients by E-mail. Perpetrators of such spam ("spammers") often harvest addresses of prospective recipients from Usenet postings or from web pages, obtain them from databases, or simply guess them by using common names and domains. Explains how to build a Debian anti-spam and anti-virus gateway E-mail server
using Postfix, amavisd-new, SpamAssassin, Razor, DCC, Pyzor and ClamAV[Unix]Search. By popular definition, spam occurs without the permission of the recipients.

Overview

As the recipient directly bears the cost of delivery, storage, and processing, one could regard spam as the electronic equivalent of "postage-due" junk mail. However, the Direct Marketing Association will point to the existence of "legitimate" e-mail marketing. Most commentators classify e-mail-based marketing campaigns where the recipient has "opted in" to receive the marketer's message as "legitimate".

Spammers frequently engage in deliberate fraud to send out their messages. Email SPAM/Virus Filtering. Spammers often use false names, addresses, phone numbers, and other contact information to set up "disposable" accounts at various Internet service providers. They also often use falsified or stolen credit card numbers to pay for these accounts. This allows them to move quickly from one account to the next as the host ISPs discover and shut down each one.

Spammers frequently go to great lengths to conceal the origin of their messages. They do this by spoofing e-mail addresses (much easier than Internet protocol spoofing). SecurenceMail - Email Filtering Anti Spam and Anti Virus Software.