Anti-spam Techniques
The U.S. Department of Energy Computer Incident Advisory Capability (CIAC) has provided specific countermeasures against email spamming.
Some popular methods for filtering and refusing spam include email filtering based on the content of the email, DNS-based blackhole lists (DNSBL), greylisting, spamtraps, Enforcing technical requirements of email (SMTP), checksumming systems to detect bulk email, and by putting some sort of cost on the sender via a Proof-of-work system or a micropayment. Each method has strengths and weaknesses and each is controversial because of its weaknesses. For example, one company's offer to " some spamtrap and honeypot addresses" from email lists, defeats the ability for those methods to identify spammers.
Outbound spam protection combines many of the techniques to scan messages exiting out of a service provider's network, identify spam and take action such as blocking the message or shutting off the source of the message.
In one study, 95% of revenues (in the study) cleared through just three banks.
Read more about this topic: Email Spam
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