loadplugin Mail::SpamAssassin::Plugin::PunctuationFrequency /path/to/PunctuationFrequency.pm
body     PUNCTUATION_BODY_50 eval:check_punctuated_word_frequency_body(50)
describe PUNCTUATION_BODY_50 At least 50% of words in body contain punctuation
score    PUNCTUATION_BODY_50 0.2

body     PUNCTUATION2_BODY_10 eval:check_punctuated_word_frequency_body(10,2,1)
describe PUNCTUATION2_BODY_10 At least 10% of words in body contain multiple interior punctuation characters
score    PUNCTUATION2_BODY_10 0.8

body     PUNCTUATION2_BODY_20 eval:check_punctuated_word_frequency_body(20,2,1)
describe PUNCTUATION2_BODY_20 At least 20% of words in body contain multiple interior punctuation characters
score    PUNCTUATION2_BODY_20 0.8

header   PUNCTUATION2_SUBJECT_10 eval:check_punctuated_word_frequency_subject(10,2)
describe PUNCTUATION2_SUBJECT_10 At least 10% of words in subject contain multiple punctuation characters
score    PUNCTUATION2_SUBJECT_10 0.1