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back-scatter

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  • motty.cruz
    Hello, User@domain.com was receiving tons of backscatter mail, I successfully block backscatter email with the following header_checks in main.cf. however, I
    Message 1 of 1 , Apr 28 10:39 AM
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      Hello,

      User@... was receiving tons of backscatter mail, I successfully block backscatter email  with the following header_checks in main.cf. however, I noticed in the logs that even genuine messages with header “Undelivered Mail Returned to Sender” are being block. Do you have any suggestions how to solved this issue?

      I had read http://www.postfix.org/BACKSCATTER_README.html#real

      Please help!

       

      Host1# vi header_checks

      /^Content-Type: multipart\/report; report-type=delivery-status\;/       REJECT no third-party DSNs

      /^Content-Type: message\/delivery-status; /                                                   REJECT no third-party DSNs

      /^Subject: Unzustellbar: Twit 99-435/                                                                    REJECT

      /^Subject: Returned Mail: *Twit 99-435/                                                               REJECT

      /^Subject: Delivery Failure/                                                                                       REJECT

      /^Subject: Delivery Status Notification (Failure)/                                             REJECT

      /^Subject: Delivery Notification: Delivery has failed/                                    REJECT

      /^Subject: Considered UNSOLICITED BULK EMAIL/                                           REJECT

      /^Subject: Undeliverable: Twitter 957-358/                                                         REJECT

      /^Subject: Mail delivery failed: returning message/                                       REJECT

      /^Subject: Returned mail: see transcript for deatils/                                      REJECT

      /^Subject: Spam: Delivery Status Notification (Failure)/                               REJECT

      /^Subject: Delivery Status/                                                                                         REJECT

      /^Subject: Undeliverable Mail/                                                                                 REJECT

       

      Apr 28 10:23:59 host postfix/smtpd[91406]: connect from pop.domain.com[192.168.1.5]

      Apr 28 10:23:59 host postfix/smtpd[91406]: AD647A1057: client=pop.domain.com[192.168.1.5]

      Apr 28 10:23:59 host postfix/cleanup[91522]: AD647A1057: reject: header Content-Type: multipart/report; report-type=delivery-status;??boundary="D77E61CC77.1272475422/pop.domain.com" from pop.domain.com[192.168.1.5]; from=<> to=<user2@...> proto=ESMTP helo=<pop.domain.com>: 5.7.1 no third-party DSNs

      Apr 28 10:23:59 host postfix/smtpd[91406]: disconnect from pop.domain.com[192.168.1.5]

      (END)

       

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