CentOS 7.2 mail Server (Postfix) _linux

Introduction of Postfix

Postfix is an e-mail server that is served by the IBM Watson Research Center (T.J). Wietse Venema, a Dutch researcher at Watson Research Center, was created to improve the SendMail mail server. First appeared in the late 1990, is an open source software.
Postfix Official website: http://www.postfix.org/
Postfix Download Address: http://www.postfix.org/download.html

Second, postfix installation

Install Postfix to configure the SMTP server
[1] Even if the CentOS system is installed with a minimal installation, Postfix is installed, but if Postfix is not installed, install it first, as shown below.
[root@linuxprobe ~]# yum-y install Postfix

[2] This example displays the SASL function that configures Smtp-auth to use Dovecot.

[Root@linuxprobe ~]# vi/etc/postfix/main.cf # line 75:uncomment and specify hostname myhostname = Linuxprobe.srv.world  # line 83:uncomment and specify domain name mydomain = srv.world # line 99:uncomment myorigin = $mydomain # line 116: Change inet_interfaces = all # line 164:add mydestination = $myhostname, localhost. $mydomain, localhost, $mydomain # l INE 264:uncomment and specify your local network Mynetworks = 127.0.0.0/8, 10.0.0.0/24 # line 419:uncomment (use Mailbo Xdir) Home_mailbox = mailbox/# line 574:add smtpd_banner = $myhostname ESMTP # Add follows to the end # limit a emai

L size for 10M message_size_limit = 10485760 # limit a mailbox to 1G mailbox_size_limit = 1073741824 # for Smtp-auth Smtpd_sasl_type = Dovecot Smtpd_sasl_path = Private/auth smtpd_sasl_auth_enable = yes smtpd_sasl_security_options = Noano Nymous Smtpd_sasl_local_domain = $myhostname smtpd_recipient_restrictions = permit_mynetworks,permit_auth_ Destination,permit_sasl_authenticated,rejECT [root@linuxprobe ~]# systemctl restart postfix [root@linuxprobe ~]# systemctl enable Postfix

 

[3] If FIREWALLD is running, please allow SMTP service. SMTP uses 25/TCP.

[ROOT@DLP ~]# firewall-cmd--add-service=smtp--permanent
Success
[ROOT@DLP
~]# Firewall-cmd]--reload Success 

Third, Dovecot installation

Install Dovecot To configure the Pop/imap server
[1] Install Dovecot.
[root@linuxprobe ~]# yum-y Install Dovecot

[2] This example shows a configuration to provide SASL functionality to postfix.

 [root@linuxprobe ~]# vi/etc/dovecot/dovecot.conf # line 24:uncomment protocols = IMAP POP3 LMTP # line 30:uncomment and change (if not use IPv6) listen = * [Root@linuxprobe ~]# Vi/etc/dovecot/conf.d/10-au Th.conf # line 10:uncomment and change (allow plain text auth) Disable_plaintext_auth = no # line 100:add Auth_mechani SMS = Plain Login [root@linuxprobe ~]# vi/etc/dovecot/conf.d/10-mail.conf # line 30:uncomment and add mail_location = ma Ildir:~/maildir [Root@linuxprobe ~]# vi/etc/dovecot/conf.d/10-master.conf # line 96-98:uncomment and add like follows # Postfix Smtp-auth Unix_listener/var/spool/postfix/private/auth {mode = 0666 user = Postfix group = Postfix} [Root@li Nuxprobe ~]# vi/etc/dovecot/conf.d/10-ssl.conf # line 8:change (not require SSL) SSL = no [Root@linuxprobe ~]#, SYSTEMCT L Start Dovecot [root@linuxprobe ~]# systemctl enable Dovecot 

[3] If FIREWALLD is running, please allow POP/IMAP service. POPs use 110/tcp,imap to use 143/TCP.

[Root@vdevops ~]# firewall-cmd--add-port={110/tcp,143/tcp}--permanent
Success
[Root@vdevops ~]# Firewall-cmd--reload
Success 

Four, SSL settings

Configure SSL to encrypt connections
[1] First create certificate, Portal: http://www.jb51.net/article/97434.htm

[2] Configure postfix and dovecot for SSL.

# Add to the ' end
Smtpd_use_tls = yes
smtpd_tls_cert_file =/etc/pki/tls/certs/server.crt
smtpd_tls_key_ File =/etc/pki/tls/certs/server.key
smtpd_tls_session_cache_database = Btree:/etc/postfix/smtpd_scache
[ Root@linuxprobe ~]# vi/etc/postfix/master.cf
# line 26-28:uncomment
Smtps inet  n  -  n  -  -  smtpd-
 o Syslog_name=postfix/smtps-
 o smtpd_tls_wrappermode=yes
[root@linuxprobe ~]# vi/etc/dovecot/conf.d/10-ssl.conf
# line 8:change
SSL = yes
# line 14,15:specify Certificates
SSL _cert = </etc/pki/tls/certs/server.crt
ssl_key = </etc/pki/tls/certs/server.key
[root@linuxprobe ~] # systemctl Restart Postfix dovecot

[3] If FIREWALLD is running, please allow smtps/pop3s/imaps service. Smtps Use 465/
Tcp,pop3s use 995/tcp,imaps to use 993/TCP.

[Root@vdevops ~]# firewall-cmd--add-service={pop3s,imaps}--permanent
Success
[Root@vdevops ~]# Firewall-cmd--add-port=465/tcp--permanent
Success
[Root@vdevops ~]# firewall-cmd--reload
Success 

Mail Log report:Pflogsumm

Install Pflogsumm This is the Postfix log reporting tool
[1] Install the postfix-perl-scripts package.

[Root@linuxprobe ~]# yum-y install postfix-perl-scripts # Generate log summary for yesterday [Root@linuxprobe ~]# Perl/ usr/sbin/pflogsumm-d yesterday/var/log/maillog Postfix Log summaries for June totals------------messages 2 R
  Eceived 5 delivered 0 forwarded 0 deferred 0 bounced 0 rejected (0%)

 0 Reject warnings 0 held 0 discarded (0%) 
2879 Bytes received 6572 bytes delivered 1 senders 1 sending hosts/domains 2 recipients 2 recipient Hosts/domains Per-hour Traffic Summary------------------------Time received delivered deferred bounced rejected---------------- ----------------------------------------------------0000-0100 0 0 0 0 0 0100-0200 0 0 0 0 0 0200-0 300 0 0 0 0 0 0300-0400 0 0 0 0 0 0400-0500 0 0 0 0 0 0500-0600 0 0 0 0 0-0600 -0700 0 0 0 0 0 0700-0800 0 0 0 0 0 0800-0900 0 0 0 0 0 0900-1000 0 0 0 0 0-10  00-1100 2 5 0 0 0 1100-1200 0 0 0 0 0 1200-1300 0 0 0 0 0 1300-1400 0 0 0 0 0 1400-1500 0-0   0 0 0 1500-1600 0 0 0 0 0 1600-1700 0 0 0 0 0 1700-1800 0 0 0 0 0 1800-1900-0    0 0 0 0 1900-2000 0 0 0 0 0 2000-2100 0 0 0 0 0 2100-2200 0 0 0 0 0 2200-2300-0 0 0 0 0 2300-2400 0 0 0 0 0 host/domain summary:message Delivery-----------------------------------  ---sent cnt bytes defers avg dly Max dly host/domain-----------------------------------------------3 4119 0 0.4 s 0.8 S Srv.world 2 2453 0 0.1 s 0.1 s Mail.srv.world host/domain summary:messages Received------------------ ---------------------msg cnt bytes host/domain--------------------------2 2879 mail.srv.world senders by Messag E Count------------------------2 cent@mail.srv.world Recipients by message Count---------------------------3 Redh At@srv.world 2 Cent@maIl.srv.world senders by message size-----------------------the 2879 cent@mail.srv.world Recipients by message size------  --------------------4119 redhat@srv.world 2453 cent@mail.srv.world message Deferral Detail:none message Bounce Detail (by relay): None-Reject Detail:none message reject warning Detail:none message hold Detail:none message Discar D detail:none SMTP delivery failures:none warnings--------tlsmgr (total:6) 3 redirecting the request to Postfix-o
   Wned data_directory/var/li ...

3 Request to Update table Btree:/etc/postfix/smtpd_scache in non-... Fatal errors:none panics:none Master daemon Messages----------------------4 daemon started--version 2.10.1, config Uration/etc/postfix 3 terminating on signal 1 reload-version 2.10.1, Configuration/etc/postfix [Root@linuxpro Be ~]# crontab-e # Send mail log summary 1:00 to Gen * * Perl/usr/sbin/pflogsumm-e-D Yesterday/var/log/maillog |

 Mail-s ' Logwatch for Postfix ' root

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