Spamassassin

local.cf

rewrite_header Subject  *****SPAM*****

report_safe             0
required_score          5.0
use_bayes               1
bayes_auto_learn        1
skip_rbl_checks         0

bayes_ignore_header X-Bogosity
bayes_ignore_header X-Spam-Flag
bayes_ignore_header X-Spam-Status

ifplugin Mail::SpamAssassin::Plugin::Shortcircuit
endif

whitelist_from *@quadbyte.de

score DOS_OUTLOOK_TO_MX 0

header RCVD_IN_FABEL rbleval:check_rbl('fabel', 'spamsources.fabel.dk.')
describe RCVD_IN_FABEL Received via a relay in spamsources.fabel.dk
tflags RCVD_IN_FABEL net
score  RCVD_IN_FABEL 4