Am 17.02.2015 um 20:03 schrieb ricky gutierrez:
Hi , I have mounted one gateway filtering me all spam in the business, I have to postfix + centos6.6 + amavisd-new 2.8 + clamav + spamassassin, currently captures 65% of spam the other 35 gets through, I want to improve the effectiveness making a Bayesian db. I am not an expert in postfix and spamassassin, I was thinking to leave a copy of all messages for the domain and classify emails as spam and ham, and then build the db, the problem is that postfix is only a gateway and leaves no emails locally! , someone has faced this type of situation?
update to Postfix 3.0 and use the new BCC feature for header_checks on the *downstream servers* to use that as training data *but* be sure you place a sieve rule there to discard all the BCC's to users without a explicit opt-in for *legal* reasons!
and protect that BCC account from receive mails on the MX! _________________________________________________the sieve rule just lists the subscribed Users in the To/Cc-Header with 'keep' and the elseif 'discard'
if you want to optimize that add your own enevlope-headers on the MX which covers also BCC and can be used by the sieve-rules instead From/Cc
http://comments.gmane.org/gmane.mail.postfix.user/193456 _________________________________________________ main.cf: header_checks = pcre:/etc/postfix/header_checks_smtpd.cf nested_header_checks = mime_header_checks = /etc/postfix/header_checks_smtpd.cf: /^X\-Spam\-Flag: Yes/ BCC spamfil...@thelounge.net/^X\-Spam\-Report: Flag: No.*(BAYES_80|BAYES_95|BAYES_99)/ BCC spamfil...@thelounge.net /^X\-Spam\-Report: Flag: No.*(BAYES_50)/ BCC spamfilter+inbox...@thelounge.net
Spamassassin local.cf: clear_headers fold_headers 1 add_header spam Flag _YESNO_add_header all Status _YESNO_, score=_SCORE_, tag-level=_REQD_, block-level=8.0
report_safe 0 add_header all Report Flag: _YESNO_, _REPORT_ rewrite_header Subject [SPAM]
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