90% of spam received by Internet users in North America and Europe is sent by a hard-core group of under 200 spam outfits, almost all of who are listed in the ROKSO database.
These known, professional, chronic spammers, many with criminal records for theft and fraud, are loosely grouped into gangs ("spam gangs") and move from network to network seeking out Internet Service Providers ("ISPs") with poor spam control and taking advantage of the slowness of some service providers to terminate them.
Reacting can be costly!
To provide a safe email haven free from spam is not a simple thing. Spammers have become extremely clever and aggressive in their work, and one no one simple software or method is effective in combating them.
The most effective solution is to use a weighted system. That means to provide a method of examining many characteristics of an incoming email message, and the server level, and giving it a score based on different tests run on it. If the score is too high, it will be considered to be spam. If the score is below a threshold, it can be considered as most likely safe. This will still allow some spam to slip through, but the vast majority of it can be eliminated without incurring the dreaded False Positive – a valuable business email that gets flagged as spam and lost.
Here Comes Spam – Head for the Border!
Few major ISPs will tolerate the complaints generated by spam companies, so spammers tend to be very mobile, by reason of necessity.
Spamming from inside of the United States is done frequently and heavily, however because of growing criminal and civil penalties for spamming, many hardened spammers move their operations overseas, where penalties are light or nonexistent.
The primary sources of spam in the world right now are Korea and China. This prevents any Internet user connecting to a Chinese or Korean ISP from sending email to any hosts using these lists.
The Internet IP addresses that are assigned to websites are managed through a not-for-profit group called ARIN, the American Registry for Internet Numbers. ARIN information changes regularly, as IP address assignments expire and renew. It is possible to query the ARIN registry and develop a list of all IP addresses that have been assigned to a particular geography. Lists of countries known to be responsible for the proliferation of spam are widely available on technical forums on the Internet, and are kept up-to-date by volunteers. Since little to no legitimate corporate email originates in either of these two armpit nations, many ISPs and web hosts use these national IP lists as filters to automatically prohibit all incoming email from these countries as a result of their lax junkmail laws and their governments’ refusal to address spam issues.

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