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From: "motty.cruz" on 28 Apr 2010 13:39
Hello,

User(a)domain.com 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(a)domain2.com>
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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