Postfix

Tarball install
[1.] wget ftp://ftp4.tnc.edu.tw/pub1/Postfix/official/postfix-2.2.10.tar.gz

[2.]

   tar zxvf postfix-2.2.10.tar.gz

   cd postfix-2.2.10 ; make ; make install

   如果有"make: don't know how to …"

      make -f Makefile.init makefiles

   如果從別台編譯後複製過來的，清除規則

      make tidy

[3.]

   postfix check

   postfix start

[Trouble shotting:]

egrep '(reject|warning|error|fatal|panic):' /var/log/maillog

[Q.] more /var/log/maillog

[A.] 查不到對方DNS的MX記錄，所以會有這錯誤

[Q.] 如果對方沒有設定 MX

[A.] 可以設定 ignore_mx_lookup_error = yes

[Q:] 不允許對方的連線 IP 沒有反解

[A:] main.cf中設定了 reject_unknown_client_hostname參數

smtpd_client_restrictions = permit_mynetworks, reject_unknown_client_hostname

[Q:] /var/log/maillog

Oct 23 19:09:57 lab100 postfix/smtpd[20028]: NOQUEUE: reject: RCPT from unknown[192.168.1.1]: 450 4.7.1 Client host rejected: cannot find your hostname, [192.168.1.1]; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<cross>

[A:] vi /etc/postfix/main.cf

smtpd_client_restrictions = permit_mynetworks, reject_unknown_reverse_client_hostname

[Q:] /var/log/maillog

Oct 23 19:21:31 lab100 postfix/smtpd[20179]: NOQUEUE: reject: RCPT from unknown[192.168.1.1]: 450 4.7.1 Client host rejected: cannot find your reverse hostname, [192.168.1.1]; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<cross>

[A:] 丟棄找不到 DNS 裡 MX / A 記錄的 hostname

smtpd_sender_restrictions = reject_unknown_sender_domain

ref:

   http://www.huihoo.com/internet/postfix/pis/book1.html

   http://www.sinsen.com.tw/callboard/schoolboard.php3?do=read_msg&board=school_board&msg_id=48&order=hit&cur_page=1