No Spam Today

• 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.
• Spammers can also use css to recycle old html-based tricks which fool spam filters that do not understand css.
• Spambots, and even Google, do not always obey the robots.
• These protocols don't come up very often in the study of spam, because they do not figure in the propagation of spam.
• Blocklist: A database of ip addresses or web urls suspected of being involved in spam or other abuse; generally a blocklist is not used by end-users, but is instead queried by mail hosts in order to reject or mark probable spam messages upon delivery.
• Now, more than ever, it is vital that true non-spam email messages be absolutely accurate and arrive at the correct location, on time.
• Law enforcement, may not be bound by onerous anti-spam laws, and are more willing to take on spammers' traffic for the money they can make.
• Graylisting requires a bit of extra work by the mx (particularly for large mailing services that must coordinate among many mx hosts), but possibly not as much cpu time as would be required to process and filter the spam if it were not rejected.
• The familiar lines showing the to-address and from-address of the message, its subject line, and its date, are technically not part of the smtp header (as properly understood); they are easy to forge and do not contain any trustworthy information that can be used in spam tracing.
• The actual smtp headers are normally hidden from users by their mail clients.

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