ppolicy daemon I

• Postfix SMTP Access Policy Delegation

• • http://www.postfix.org/SMTPD_POLICY_README.html
  • checking mail during SMTP connection
  • • rejecting mail early stage of mail reception
    • • use less resources (bandwidth, cpu – antivir/antispam, ...)
    • we don't send any bounce mail (backscatter mail)
    • it is up to sender mail server to generate correct delivery failure message (using information from our reject code)
    • less informations
    • • client ip/name, sender, recipient, hello name, sasl info, ...
    • short time to check (otherwise SMTP conn. can timeout)
    • problems in case of fatal error
    • • temporary rejecting mail (mailing lists, incorr. conf. servers )
      • depends on correct configuration of ppolicy daemon
    • rejecting mail with code 450 => it will come again, again, ...
  • any ideas what to check/reject? Stat. analysis.