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How to easily write spamassassin's rules

SpamAssassin is a sotfware which is usually used by administrators of mail servers to filter / tagging the mail in transit by using algorithms to calculate the probability.

Write simple rules to assign a score based on the classic pattern matching is a snap.

http://wiki.apache.org/spamassassin/WritingRules

Position yourself to / etc / spamassassin (or the dir containing the file local.cf) and create an empty text file called eg XX_yourrole.cf 15_myroles.cf

Start by entering a few rules for Match of the most common items of postal banking phishing

header LOCAL_ET_PHISHINGAB ALL =~ /Nuovi servizi online di Poste.it/i
score  LOCAL_ET_PHISHINGAB 20.1

header LOCAL_ET_PHISHINGAC ALL =~ /Comunicazione nr. [0-9]{1,} del [0-9]{2} [a-zA-Z]{1,} [0-9]{4}/i
score  LOCAL_ET_PHISHINGAC  20.1

header LOCAL_ET_PHISHINGAD ALL =~ /Comunicazione Nr_0X[ABCDEF0-9]{2}.0X[ABCDEF0-9]{2}.0X[ABCDEF0-9]{2}.0X[ABCDEF0-9]{2} del [0-9]{2} [a-zA-Z]{1,} [0-9]{4} - Leggere con attenzione/i
score  LOCAL_ET_PHISHINGAD  20.1

The inizia con i caratteri “nr_0x” ed è seguita da due caratteri compresi nell'elenco fra le parentesi quadre (in questo caso facenti parte dell'insieme dei caratteri utilizzati per la rappresentazione esadecimale). begins with the characters "nr_0x" and is followed by two characters listed between the brackets (in this case part of the character used to represent hexadecimal).

Considerazioen next example looks at where you want to assign a positive score to messages containing a string generic constant (stick) preceded by possible strings x which determine uniquely the context spam

 header LOCAL_ET_SUBJECTA ALL =~ /(Very-very magic|Joy|Long|Super|Enjoy with you hard).*stick/ header LOCAL_ET_SUBJECTA ALL = ~ / (Very-very magic | Joy | Long | Super | Enjoy with you hard) .* stick /

In this case block "stick" would be a bit 'too narrowly, creating better regexp targeted.

If the spammer uses algorithms to generate email for example

online casino
cassino oonline
ccasino onliine

can easily bypassing them with a regexp type

/(c.?a.?s.?i.?n.?o.*o.?n.?l.?i.?n.?e)/i

Before relaod your new ruleset is syntactically correct check that your new file. Cf with

# spamassassin -D --lint

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