介绍

介绍

介绍

  1. 带有 Centos 6.7 i686 的新 digitalocean droplet(centos-release-6-7.el6.centos.12.3.i686)

  2. Nginx 1.1.13 (从源代码构建):

  3. 赛勒斯:

    $ sudo yum install cyrus-sasl cyrus-imapd
    $ sudo vi vi /etc/cyrus.conf: 
     -> https://gist.github.com/c80609a/7190c4981365447063ce2e06a517d9fd
    $ sudo vi /etc/sasl2/smtpd.conf:
     -> pwcheck_method: auxprop
     -> auxprop_plugin: sasldb
     -> mech_list: PLAIN LOGIN CRAM-MD5 DIGEST-MD5 
     ...
    $ sudo chkconfig --level 345 cyrus-imapd on
    $ sudo service cyrus-imapd start
    $ sudo service cyrus-imapd status
     -> cyrus-imapd (pid  1851) is running...
    
  4. POSTFIX(postfix-2.6.6-6.el6_7.1.i686)

    $ sudo yum install postfix
    $ sudo vi /etc/postfix/master.cf
    -> https://gist.github.com/c80609a/07b397d2baa7455896bb704aa2a7479a 
    $ sudo vi /etc/postfix/main.cf
    -> https://gist.github.com/c80609a/831168401df84b395c393b09a3cda384 
    $ sudo vi /etc/postfix/virtual: [email protected] webmaster\@site.org
    $ sudo postmap /etc/postfix/virtual 
    $ sudo touch /etc/postfix/body_checks 
    $ sudo service postfix stop
    $ sudo service postfix reload
    $ sudo postfix upgrade-configuration
    $ sudo service postfix start
    $ sudo service postfix status
    master (pid  16811) is running...
    $ sudo postfix status
    postfix/postfix-script: the Postfix mail system is running: PID: 16811  
    
  5. 添加了两条记录(digitalocean.com -> 登录 -> 网络):

    A mail 95.85.24.200
    MX 5 mail.site.org.
    
  6. 邮件发送成功:

    $ echo 'test' | mail -s 'test' [email protected]
    

问题

  1. Telnet 连接被拒绝:

    $ telnet localhost 25
    Trying ::1...
    telnet: connect to address ::1: Connection refused
    Trying 127.0.0.1...
    Connected to localhost.
    Escape character is '^]'.
    

    尝试谷歌主机-确定:

    $ telnet gmail-smtp-in.l.google.com 25
    Trying 74.125.136.26...
    Connected to gmail-smtp-in.l.google.com.
    Escape character is '^]'.
    220 mx.google.com ESMTP t6si2618629wjt.255 - gsmtp
    quit
    221 2.0.0 closing connection t6si2618629wjt.255 - gsmtp
    Connection closed by foreign host.
    
  2. 意外的 netstat 输出(最后一列未定义):

    $ netstat -ln |grep :25
    tcp        0      0 0.0.0.0:25                  0.0.0.0:*                   LISTEN
    

    预期结果:

    tcp        0      0 0.0.0.0:25                  0.0.0.0:*                   LISTEN      16811/master
    

我该如何解决这些问题?

答案1

您收到的连接被拒绝仅发生在 IPv6 上,在 IPv4 地址 (127.0.0.1) 上您确实可以连接。如果您想启用 IPv6,您需要在 中添加以下行main.cf

inet_protocols = ipv4, ipv6

关于 netstat 输出,您需要使用-p开关显示进程名称,比较:

mtak@dc2:~$ netstat -ln | grep 25
tcp        0      0 0.0.0.0:25       0.0.0.0:*            LISTEN     
tcp6       0      0 :::25            :::*                 LISTEN     

mtak@dc2:~$ sudo netstat -pln | grep 25
tcp        0      0 0.0.0.0:25    0.0.0.0:*   LISTEN      3102/master     

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