{"id":3588,"date":"2014-09-21T23:56:58","date_gmt":"2014-09-21T15:56:58","guid":{"rendered":"http:\/\/rmohan.com\/?p=3588"},"modified":"2014-09-22T00:01:22","modified_gmt":"2014-09-21T16:01:22","slug":"postfix-on-centos-6-4","status":"publish","type":"post","link":"https:\/\/mohan.sg\/?p=3588","title":{"rendered":"Postfix on CentOS 6.4"},"content":{"rendered":"


\nMAIL SERVERSETUP USING POSTFIX ON CENTOS 6.4<\/a><\/strong><\/h2>\n

Part 1 MTA Postfix<\/strong><\/p>\n

    \n
  • Chapter 1 Email Service<\/strong><\/li>\n
  • Chapter 2 Mail Transfer Agents<\/strong><\/li>\n
  • Chapter 3 Installation and Startup<\/strong><\/li>\n
  • Chapter 4 Postfix Configuration<\/strong><\/li>\n<\/ul>\n

    Part 2 IMAP & POP3 Server<\/strong><\/p>\n

      \n
    • Chapter 5 IMAP and POP3 on Dovecot<\/strong><\/li>\n
    • Chapter 6 MUA Configuration<\/strong><\/li>\n<\/ul>\n

      Part 3 Postfix aliases & access control<\/strong><\/p>\n

        \n
      • Chapter 7 Postfix Aliases<\/strong><\/li>\n
      • Chapter 8 Postfix Access Control<\/strong><\/li>\n
      • Chapter 9 Postfix Mailing List using Mailman<\/strong><\/li>\n<\/ul>\n

        Part 4 Postfix Authentication<\/strong><\/p>\n

          \n
        • Chapter 10 Postfix Authentication using SASL<\/strong><\/li>\n
        • Chapter 11 Postfix Mail Encryption using SSL\/TLS<\/strong><\/li>\n<\/ul>\n

          Part 5 Postfix security<\/strong><\/p>\n

            \n
          • Chapter 12 Postfix Antispam<\/strong><\/li>\n
          • Chapter 13 Postfix Antivirus<\/strong><\/li>\n<\/ul>\n

            Part 6 Postfix Extended Features<\/strong><\/p>\n

              \n
            • Chapter 14 Postfix Backup mail server (Queuing Server)<\/strong><\/li>\n
            • Chapter 15 Squirrelmail as a webmail<\/strong><\/li>\n
            • Chapter 16 Postfix Admin with MySQL<\/strong><\/li>\n<\/ul>\n

              Mail Server Testing Environment<\/strong><\/p>\n

              \u00a01.sever.chul.com: 192.168.80.5<\/strong><\/p>\n

              l\u00a0 Postfix Mail\u00a0 server (ms1.chul.com)<\/strong><\/p>\n

              l\u00a0 MUA – Evolution<\/strong><\/p>\n

              \u00a02.client.chul.com: 192.168.80.6<\/strong><\/p>\n

              l\u00a0 Linux mail client<\/strong><\/p>\n

              l\u00a0 MUA – Thunderbird<\/strong><\/p>\n

              l\u00a0 Postfix Backup Mail server (ms2.chul.com)<\/strong><\/p>\n

                \n
              1. Windows 7<\/strong><\/li>\n<\/ol>\n

                l\u00a0 Mail client using MS Outlook 2010<\/strong><\/p>\n

                Chapter 1 Email Service<\/strong><\/p>\n

                E-mail System Components<\/strong><\/p>\n

                1.Mail User Agent (MUA):<\/p>\n

                A client used to compose and read e-mail (Outlook, Evolution, Thunderbird, Mutt)<\/p>\n

                2.Mail Transfer Agent (MTA):<\/p>\n

                An SMTP server used to relay or accept e-mail for delivery (Postfix, Sendmail, Exim, Qmail, Exchange server)<\/p>\n

                3.Mail Delivery Agent (MDA):<\/p>\n

                A program used by the final MTA to deliver e-mail to the message store<\/p>\n

                May be included with the MTA or a separate program such as procmail<\/p>\n

                4.Mail Access Agent (MAA):<\/p>\n

                An IMAP\/POP3 server used by an MUA to access the message store (Dovecot, Cyrus IMAP)<\/p>\n

                Chapter 2 Mail Transfer Agents<\/strong><\/p>\n\n\n\n\n\n\n\n
                Agent<\/strong><\/td>\nDescription<\/strong><\/td>\n<\/tr>\n
                Sendmail<\/strong><\/td>\nSendmail mail transfer agent, popular but insecure, complicated to configurewww.sendmail.com<\/strong><\/td>\n<\/tr>\n
                Postfix<\/strong><\/td>\nFast, easy to configure, and secure mail transfer agent compatible with Sendmail and designed to replace itwww.postfix.org<\/strong><\/td>\n<\/tr>\n
                Qmail<\/strong><\/td>\nFast, flexible, and secure MTA with its own implementation and competitive with Postfixwww.qmail.org<\/strong><\/td>\n<\/tr>\n
                Exim<\/strong><\/td>\nMTA based on smail3www.exim.org<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                Chapter 3\u00a0 Installation and startup<\/strong><\/p>\n

                  \n
                1. Package installation<\/li>\n<\/ol>\n

                  l\u00a0 postfix-2.6.6-2.2.el6_1.i686<\/p>\n

                    \n
                  1. Service startup and main directory<\/li>\n<\/ol>\n

                    # service sendmail stop<\/p>\n

                    # service postfix start<\/p>\n

                    # ls \u2013l \/etc\/postfix<\/p>\n

                      \n
                    1. Service startup checking<\/li>\n<\/ol>\n

                      # ps \u2013ef | grep postfix<\/p>\n

                      # netstat \u2013nat | grep 25<\/p>\n

                        \n
                      1. Runlevel registration<\/li>\n<\/ol>\n

                        # chkconfig\u00a0 postfix on<\/p>\n

                        # chkconfig \u2013list postfix<\/p>\n

                          \n
                        1. Testing on command<\/li>\n<\/ol>\n

                          # telnet localhost 25<\/p>\n

                          # mail \u2013v \u2013s \u2018testing mail\u2019\u00a0 linux@chul.com < \/etc\/passwd<\/p>\n

                          Chapter 4\u00a0 Postfix Configuration<\/strong><\/p>\n

                            \n
                          1. How to use postconf<\/li>\n
                          2. postconf can display or edit \/etc\/postifx\/main.cf settings<\/li>\n
                          3. postconf : Display all settings including defaults:<\/li>\n
                          4. postconf \u2013n : Display changes from default settings:<\/li>\n
                          5. Modify current main.cf: postconf -e ‘parameter=value\u2018<\/li>\n<\/ol>\n

                            # postconf -e mynetworks_style=subnet<\/p>\n

                              \n
                            1. Much simpler than editing \/etc\/mail\/sendmail.cf<\/li>\n
                            2. Postfix Daemons – \/etc\/postfix\/master.cf<\/li>\n
                            3. master: postfix master process, runs Postfix daemons on demand<\/li>\n
                            4. smtpd: postfix smtp server, accepts network connection requests and performs zero or more SMTP transactions per\u00a0 connection<\/li>\n
                            5. pickup: Postfix local mail pickup, waits for hints that new mail has been<\/li>\n<\/ol>\n

                              dropped into the \u2018maildrop\u2019 directory, and\u00a0 feeds\u00a0 it\u00a0 into\u00a0 the \u2018cleanup\u2019\u00a0 daemon.<\/p>\n

                                \n
                              1. qmgr: postfix queue manager, awaits the arrival of incoming mail and<\/li>\n<\/ol>\n

                                arranges for its delivery via Postfix delivery processes.<\/p>\n

                                  \n
                                1. Postfix: Accepting Inbound E-mail<\/li>\n
                                2. listen on port 25\/tcp on all IP addresses<\/li>\n<\/ol>\n

                                  inet_interfaces = all<\/p>\n

                                    \n
                                  1. include all domains\/hosts for which we accept local delivery<\/li>\n<\/ol>\n

                                    myhostname = server.chul.com<\/p>\n

                                    mydomain = chul.com<\/p>\n

                                    mydestination = $myhostname, $mydomain, jeong.com, localhost<\/p>\n

                                      \n
                                    1. Postfix: Outbound SMTP Relay<\/li>\n
                                    2. To relay e-mail sent by hosts on your internal network to the Internet:<\/li>\n<\/ol>\n

                                      inet_interfaces = all<\/p>\n

                                        \n
                                      1. To include all internal nets or hosts for which it will relay<\/li>\n<\/ol>\n

                                        mynetworks = 127.0.0.0\/8\u00a0 192.168.80.0\/24<\/p>\n

                                        mynetworks_style = subnet<\/p>\n

                                          \n
                                        1. Postfix: Masquerading<\/li>\n
                                        2. Causes MTA to modify the envelope & headers of an outbound e-mail message<\/li>\n
                                        3. Reduces the number of MX records and hosts\/domains to be listed in mydestination<\/li>\n<\/ol>\n

                                          myorigin = chul.com<\/p>\n

                                          masquerade_exceptions = root<\/p>\n

                                            \n
                                          1. Postfix Operation<\/li>\n
                                          2. always_bcc = address : Writes all messages<\/li>\n
                                          3. postqueue \u2013p : Displays status of the mail queues<\/li>\n
                                          4. postqueue \u2013f : Attempts to immediately deliver all queued mail<\/li>\n
                                          5. tail -f \/var\/log\/maillog : Watch the mail log update in real time<\/li>\n
                                          6. Testing mail sending and receiving using domains<\/li>\n<\/ol>\n

                                            Chapter 5 IMAP and POP3 on Dovecot<\/strong><\/p>\n

                                            1.Dovecot supports POP3, POP3s, IMAP, and IMAPs<\/p>\n

                                            # yum -y install dovecot<\/p>\n

                                              \n
                                            1. # vi \/etc\/dovecot\/dovecot.conf<\/li>\n<\/ol>\n
                                                \n
                                              • protocols = imap pop3<\/li>\n
                                              • listen = *<\/li>\n<\/ul>\n
                                                  \n
                                                1. # vi \/etc\/dovecot\/conf.d\/10-auth.conf<\/li>\n<\/ol>\n
                                                    \n
                                                  • disable_plaintext_auth = no<\/li>\n
                                                  • auth_mechanisms = plain login<\/li>\n<\/ul>\n
                                                      \n
                                                    1. # vi \/etc\/dovecot\/conf.d\/10-mail.conf<\/li>\n<\/ol>\n
                                                        \n
                                                      • mail_location = maildir:~\/Maildir<\/li>\n<\/ul>\n
                                                          \n
                                                        1. # vi \/etc\/dovecot\/conf.d\/10-master.conf<\/li>\n<\/ol>\n
                                                            \n
                                                          • unix_listener auth-userdb {<\/li>\n
                                                          • mode = 0600<\/li>\n
                                                          • user = postfix<\/li>\n
                                                          • group = postfix<\/li>\n
                                                          • }<\/li>\n<\/ul>\n

                                                            # service dovecot start<\/p>\n

                                                            # chkconfig dovecot on<\/p>\n

                                                              \n
                                                            1. Testing dovecot<\/li>\n<\/ol>\n

                                                              # telnet localhost 110<\/p>\n

                                                              # telnet localhost 143<\/p>\n

                                                              Chapter 6 MUA Configuration<\/strong><\/p>\n

                                                              1.Graphical:<\/p>\n

                                                              l\u00a0 Evolution on Server system of Linux for POP3<\/p>\n

                                                              # yum install evolution<\/p>\n

                                                              user is tland@chul.com<\/p>\n

                                                              l\u00a0 Thunderbird on Client system of Linux for IMAP<\/p>\n

                                                              # yum install thunderbird<\/p>\n

                                                              user is admin@chul.com<\/p>\n

                                                              l\u00a0 Outlook 2010 on Client system of Windows 7 for IMAP<\/p>\n

                                                              user is jeong@chul.com<\/p>\n

                                                              2.Text-mode: Mutt and Fetchmail<\/p>\n

                                                              # mutt -f pop:\/\/user@server<\/p>\n

                                                              # mutt -f pops:\/\/user@server<\/p>\n

                                                              Chapter 7 Postfix Aliases<\/strong><\/p>\n

                                                                \n
                                                              1. Postfix Aliases<\/li>\n<\/ol>\n

                                                                1) Local Aliases \u2013\u00a0 mail forwarding<\/p>\n

                                                                2) Virtual Aliases \u2013 Incoming and Outgoing Aliases<\/p>\n

                                                                2.1) Incoming Aliases for Multiple domains (jeong.com, linux.com)<\/p>\n

                                                                  \n
                                                                1. Virtual Alias Domains \u2013 Virtual domains using Linux system accounts<\/li>\n
                                                                2. Virtual Mailbox Domains \u2013 Virtual domains using non-Linux accounts<\/li>\n
                                                                3. Virtual Mailbox Domains using Database such as MySQL and LDAP<\/li>\n<\/ol>\n

                                                                  – Virtual domains and user mapping using Database<\/p>\n

                                                                  2.2) Outgoing Aliases \u2013 change sender\u2019s mail address to receiver (Masquerading)<\/p>\n

                                                                    \n
                                                                  1. Postfix Local Aliases (\/etc\/aliases)<\/li>\n
                                                                  2. \/etc\/aliases contains alias maps<\/li>\n<\/ol>\n

                                                                    postmaster:\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0root<\/p>\n

                                                                    admin:\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 tland@chul.com<\/p>\n

                                                                    alist:\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 kim,itc,dara,tland<\/p>\n

                                                                    tland:\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 linux,jeong<\/p>\n

                                                                      \n
                                                                    1. Using aliases<\/li>\n<\/ol>\n

                                                                      # vi \/etc\/postfix\/main.cf<\/p>\n

                                                                      alias_maps = hash:\/etc\/aliases<\/p>\n

                                                                      # newaliases\u00a0\u00a0\u00a0 or\u00a0\u00a0\u00a0 service postfix restart<\/p>\n

                                                                      # ls \u2013l \/etc\/aliases*<\/p>\n

                                                                      3.Incoming Virtual Aliases<\/p>\n

                                                                      3.1 Virtual Alias Domains \u2013 multiple domains using system accounts<\/p>\n

                                                                        \n
                                                                      1. Check \/etc\/postfix\/master.cf<\/li>\n<\/ol>\n

                                                                        virtual\u00a0\u00a0 unix\u00a0 –\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 –\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 –\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 virtual<\/p>\n

                                                                          \n
                                                                        1. Add two alias domains to \/etc\/postfix\/main.cf<\/li>\n<\/ol>\n

                                                                          virtual_alias_domains = jeong.com, linux.com<\/p>\n

                                                                          virtual_alias_maps = hash:\/etc\/postfix\/virtual<\/p>\n

                                                                            \n
                                                                          1. Create virtual mapping to \/etc\/postfix\/virtual<\/li>\n<\/ol>\n

                                                                            admin@jeong.com\u00a0 \u00a0\u00a0\u00a0\u00a0 admin<\/p>\n

                                                                            info@jeong.com\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 jeong<\/p>\n

                                                                            admin@linux.com\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 linux<\/p>\n

                                                                            info@linux.com\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 itc<\/p>\n

                                                                            @jeong.com\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 catchall\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/user unknown<\/p>\n

                                                                            @linux.com\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 catchall\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/user unknown<\/p>\n

                                                                              \n
                                                                            1. File hash<\/li>\n<\/ol>\n

                                                                              # postmap \/etc\/postfix\/virtual; ls \u2013l \/etc\/postfix\/virtual*<\/p>\n

                                                                              # service postfix restart<\/p>\n

                                                                              3.2 Virtual Mailbox Domains \u2013 multiple domains with non-Linux accounts<\/p>\n

                                                                                \n
                                                                              1. Check \/etc\/postfix\/master.cf<\/li>\n<\/ol>\n

                                                                                virtual\u00a0\u00a0 unix\u00a0 –\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 –\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 –\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 virtual<\/p>\n

                                                                                  \n
                                                                                1. Add two alias domains to \/etc\/postfix\/main.cf<\/li>\n<\/ol>\n

                                                                                  virtual_mailbox_domains = jeong.com, linux.com<\/p>\n

                                                                                  virtual_mailbox_base = \/var\/spool\/mailbox<\/p>\n

                                                                                  virtual_mailbox_maps = hash:\/etc\/postfix\/vmailbox<\/p>\n

                                                                                  virtual_uid_maps = static:1000<\/p>\n

                                                                                  virtual_gid_maps = static:1000<\/p>\n

                                                                                    \n
                                                                                  1. Create virtual mapping to \/etc\/postfix\/vmailbox<\/li>\n<\/ol>\n

                                                                                    admin@jeong.com\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 jeong.com\/admin<\/p>\n

                                                                                    info@jeong.com\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 jeong.com\/info<\/p>\n

                                                                                    admin@linux.com\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 linux.com\/admin<\/p>\n

                                                                                    info@linux.com\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 linux.com\/info<\/p>\n

                                                                                    @jeong.com\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 jeong.com\/catchall<\/p>\n

                                                                                    @linux.com\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 linux.com\/catchall<\/p>\n

                                                                                      \n
                                                                                    1. Create User and Directory and File hashing<\/li>\n<\/ol>\n

                                                                                      # useradd \u2013u 1000 vuser<\/p>\n

                                                                                      # mkdir \u2013p \/var\/spool\/vmailbox\/jeong.com\u00a0\u00a0\u00a0 linux.com<\/p>\n

                                                                                      # chown vuser.vuser \/var\/spool\/vmailbox; chmod 700 \/var\/spool\/vmailbox<\/p>\n

                                                                                      # postmap \/etc\/postfix\/vmailbox; ls \u2013l \/etc\/postfix\/vmailbox*<\/p>\n

                                                                                      # service postfix restart<\/p>\n

                                                                                      3.3 Virtual Mailbox Domains using Database like MySQL<\/p>\n

                                                                                        \n
                                                                                      1. Checking Postfix for MySQL Map Support<\/li>\n<\/ol>\n

                                                                                        # postconf \u2013m<\/p>\n

                                                                                          \n
                                                                                        1. Configuring Database<\/li>\n<\/ol>\n

                                                                                          Create db, table and users on MySQL<\/p>\n

                                                                                            \n
                                                                                          1. Configuring Postfix to Use the Database<\/li>\n<\/ol>\n

                                                                                            # vi \/etc\/postfix\/main.cf<\/p>\n

                                                                                            virtual_mailbox_domains = mysql:\/etc\/postfix\/sql\/virtual_mailbox_domains.cf<\/p>\n

                                                                                            virtual_uid_maps = mysql:\/etc\/postfix\/sql\/virtual_uid_maps.cf<\/p>\n

                                                                                            virtual_gid_maps = mysql:\/etc\/postfix\/sql\/virtual_gid_maps.cf<\/p>\n

                                                                                            virtual_mailbox_maps = mysql:\/etc\/postfix\/sql\/virtual_mailbox_recipients.cf<\/p>\n

                                                                                            virtual_alias_maps = mysql:\/etc\/postfix\/sql\/virtual_alias_maps.cf<\/p>\n

                                                                                            # mkdir \/etc\/postfix\/sql<\/p>\n

                                                                                            # service postfix restart<\/p>\n

                                                                                              \n
                                                                                            1. Postfix Outgoing Aliases (\/etc\/postfix\/generic)<\/li>\n
                                                                                            2. Activate outgoing aliases in \/etc\/postfix\/main.cf<\/li>\n<\/ol>\n

                                                                                              smtp_generic_maps = hash:\/etc\/postfix\/generic<\/p>\n

                                                                                                \n
                                                                                              1. Creating table in \/etc\/postfix\/generic<\/li>\n<\/ol>\n

                                                                                                root@server.chul.com\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 admin@chul.com<\/p>\n

                                                                                                linux@chul.com\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 linux@jeong.com<\/p>\n

                                                                                                  \n
                                                                                                1. Save and close the file. Create or update generic postfix table<\/li>\n<\/ol>\n

                                                                                                  # postmap \/etc\/postfix\/generic<\/p>\n

                                                                                                    \n
                                                                                                  1. Restart postfix<\/li>\n<\/ol>\n

                                                                                                    # service postfix restart<\/p>\n

                                                                                                      \n
                                                                                                    1. Alias Testing<\/li>\n
                                                                                                    2. Local aliases<\/li>\n
                                                                                                    3. Incoming virtual alias testing \u2013 virtual domains and virtual box<\/li>\n
                                                                                                    4. Outgoing virtual alias testing using MTA such as gmail, naver and yahoo<\/li>\n<\/ol>\n

                                                                                                      Chapter 8\u00a0 Postfix Access Control<\/strong><\/p>\n

                                                                                                        \n
                                                                                                      1. Activate access control in \/etc\/postfix\/main.cf<\/li>\n<\/ol>\n

                                                                                                        smtpd_client_restrictions =<\/p>\n

                                                                                                        check_client_access hash:\/etc\/postfix\/access<\/p>\n

                                                                                                          \n
                                                                                                        1. Creating access file format in \/etc\/postfix\/access<\/li>\n<\/ol>\n

                                                                                                          1.2.3\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 REJECT<\/p>\n

                                                                                                          192.168.80.0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 OK<\/p>\n

                                                                                                          admin@spammer.com\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 OK<\/p>\n

                                                                                                          server.spammer.com\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 REJECT<\/p>\n

                                                                                                          chul.com\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 OK<\/p>\n

                                                                                                            \n
                                                                                                          1. Creating Hash file<\/li>\n<\/ol>\n

                                                                                                            # postmap\u00a0 \/etc\/postfix\/access<\/p>\n

                                                                                                            # service postfix restart<\/p>\n","protected":false},"excerpt":{"rendered":"

                                                                                                            MAIL SERVERSETUP USING POSTFIX ON CENTOS 6.4 <\/p>\n

                                                                                                            Part 1 MTA Postfix<\/p>\n

                                                                                                            Chapter 1 Email Service Chapter 2 Mail Transfer Agents Chapter 3 Installation and Startup Chapter 4 Postfix Configuration <\/p>\n

                                                                                                            Part 2 IMAP & POP3 Server<\/p>\n

                                                                                                            Chapter 5 IMAP and POP3 on Dovecot Chapter 6 MUA Configuration <\/p>\n

                                                                                                            Part 3 Postfix aliases & access control<\/p>\n

                                                                                                            Chapter […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[33,45],"tags":[],"_links":{"self":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts\/3588"}],"collection":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3588"}],"version-history":[{"count":2,"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts\/3588\/revisions"}],"predecessor-version":[{"id":3590,"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts\/3588\/revisions\/3590"}],"wp:attachment":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3588"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3588"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3588"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}