Open Source Anti Spam

• Ndr spam uses a faked standard email non-delivery report (ndr) that a recipient will think is genuine, tricking them into opening an attachment that is spam.
• Usually, open proxies are not detected until they have become so bogged-down with botnet traffic that they no longer have cpu time left to provide good performance for their owners' own tasks.
• Social engineering is the act of conning email recipients into opening messages, revealing passwords or providing other confidential information by appealing to their curiosity, gullibility or computing naivety.
• A pink contract will allow the spammer to send bulk email through open relays on their servers.
• Postfix is an open-source mail transfer agent program and is an alternative to sendmail.
• Portal sites are often open proxy machines belonging to unknowing home users.
• Most mail host administrators have eliminated open relays, requiring either the sending host or the recipient (or both) to be within the mail host's domain, or else requiring the sending host to validate itself with a user name and password.
• Set your email program like microsoft outlook express to not display the preview panel (see outlook express menu item 'view' then 'layout') because just opening a spam email might be enough to send information back to the sender that your email address is valid.
• Direct-to-mx mailing can be done from a simple dialup or broadband account belonging to the spammer, or by open proxy machines controlled by the spammer.
• Thunderbird (Mozilla): an opensource competitor to Outlook Express which has gained huge support since it was launched.
• The vast majority of spams are sent via direct-to-mx, usually from open proxies.

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