Конфиг файл.
# How many hits before a message is considered spam.
required_hits           7.0

# Whether to change the subject of suspected spam

# Text to prepend to subject if rewrite_subject is used
rewrite_header Subject *****SPAM*****

# Encapsulate spam in an attachment
report_safe             1

# Use terse version of the spam report
use_terse_report        0

# Enable the Bayes system
#use_bayes               1

# Enable Bayes auto-learning
#auto_learn              1
#bayes_auto_learn_threshold_spam         15
#bayes_auto_learn_threshold_nonspam      0.1
#bayes_journal_max_size 0
#bayes_expiry_max_db_size 200000

# Enable or disable network checks
#skip_rbl_checks         1
#use_razor2              1
#use_dcc                 1
#use_pyzor               1

ok_languages            en ru

Лог /var/spool/qmailscan/qmail-queue.log:
Wed, 27 Jul 2005 01:31:49 YEKST:8546: SA: yup, this smells like SPAM - hits=13.8/7.0/7.0 - tagging message...
Wed, 27 Jul 2005 01:31:49 YEKST:8546: SA: finished scan in 5.468837 secs - hits=13.8/7.0
Wed, 27 Jul 2005 01:31:49 YEKST:8546: p_s: finished scan in 0.015566 secs
Wed, 27 Jul 2005 01:31:49 YEKST:8546: ini_sc: finished scan of "/var/spool/qmailscan/tmp/mx11224062757188546"...

Судя по всему должно быть нормально, но тем не менее тема письма не меняется.... (