Custom SpamAssassin Rules
Last Update: December 10 2010
SpamAssassin can be or is a very good way to fight spam. But there is one problem: The rules are sometimes old, not updated anymore or they don't help you at all (depending what kind of company you work for).
So when I first saw that SpamAssassin still lets through a lot of spam mails, I went on the SARE Rules Website. This site has some additional rules to download, but unfortunately I read on the website that the "SARE Ninjas" are currently too busy with their lives to update the website and the rules. I still use these rules, I am not saying they're bad, but every serveradmin should consider writing your own SpamAssassin rules -> and that's what I did.
I will update this cf file regularly, so you may want to redownload it or start a wget from time to time. The filename will stay the same.You may either download the file and store it with your other SpamAssassin cf files (usually in /usr/share/spamassassin) or copy/paste the content of it into ~/.spamassassin/user_prefs.
Please note, the spam scorings are pretty high. I used huge scorings for certain words/expressions where I was sure that they're spam, at least the mails I observed on my mailserver were like this. You may want to adjust that, depending on the types of e-mails you receive.
Here are some notes for some of the rules (not necessarily updated, check out the description rows in the 75_ckrules.cf file instead):
|CK_VIAGRA_MENTIONED||Checks the body of the e-mail for the word "Viagra"|
|CK_LOTTERY_WINNING||Checks the body for typical winning notification words|
|CK_CASINO_LOTTO||Checks the body for typical Casino and/or Lotto words|
|CK_VIAGRA_SUBJECT||Checks the subject for the word Viagra|
|CK_CIALIS_SUBJECT||Checks the subject for the word Cialis|
|CK_DIVERS_SUBJECT||Checks the subject for a whole bunch of words|
|CK_DIVERS_BODY||Checks the body for a whole bunch of words|
|CK_ERECT_SUBJECT||Checks the subject for words like erection|
|CK_SEX_SUBJECT||Checks the subject for the word sex|
|CK_SUBJECT_COCK||Checks the subject for the word cock|
|CK_SUBJECT_DICK||Checks the subject for the word dick; this scoring is lower because Dick could also be a name|
|CK_MEDICAL_SUBJECT||Checks the subject for typical medical words|
|CK_MEDICAL_BODY||Checks the body for typical medical words|
|CK_RAMADAN_SPAMS||Checks the subject for Ramadan Greetings - there were tons of spams like this in August 2009|
|CK_STRONG_MENTIONED||Checks the body for a combination of strong followed by another word (e.g. health = strong health)|
|CK_BEST_MENTIONED||Checks the body for a combination of best followed by another word (e.g. health = best health)|
|CK_ONLINE_MENTIONED||Checks the body for a combination of online followed by another word (e.g. casino = online casino)|
|CK_FREE_MENTIONED||Checks the body for a combination of free followed by another word (e.g. casino = free casino)|
|CK_PHISHING_BEGGING||Checks the body for typical phishing/begging words (my husband died and I want you to transfer money...)|
|CK_INTERNET_CONNECT||Checks the body for "You need to be connected to the Internet to view and follow link". There are currently lots of spams going around with this content (September 2009).|
|CK_DOMAIN_LISTING||Checks the subject for "This is your Final Notice of Domain Listing". A company which wants to charge you to list your domain - unnecessary list and half-illegal method.|
|CK_SPAM_ADDRESS||Checks the sender e-mail address - if it matches add scoring.|
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