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Postfix-mail-Centos-6.4.md

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Here we going to see about basic SMTP Configuration Here I'm using Postfix to install and configure to send mail from Centos server to any other Server's

Distribution I'm using is Centos 6.4

[root@Centosserver ~]# cat /etc/redhat-release 
CentOS release 6.4 (Final)

Scenario

Pacakge		--->	postfix
script		--->	/etc/init.d/postfix
Config File	--->	/etc/postfix/main.cf
Config File	--->	/etc/postfix/master.cf
Port No		--->	25
Queue Directory	--->	/var/spool/postfix

Step 1:

Install the postfix Pacakge

# yum install postfix

Step 2:

Edit the Configuration file of Postfix using vim editor

# vim /etc/postfix/main.cf

Uncomment and Replace the Hostname in Line 75

myhostname = Centosserver.example.com

In Line 98 Uncomment and Don't need to do changes there.

myorigin = $myhostname

In Line 113, Uncomment. UnCommenting this line will make it to receive mail from all networks

inet_interfaces = all

In Line 116 Comment with # Here we Commenting With # Because we need to Receive mails from all hosts, If this not uncommented, Only localhost mails can recive

#inet_interfaces = localhost

In Line 264, Uncomment and add the Network Range were Our Server Located

mynetworks = 168.100.189.0/28, 127.0.0.0/8, 192.168.0.0/24

Here i Have added 192.168.0.0/24 for tutorial Puropose

In Line 426, uncomment

mail_spool_directory = /var/spool/mail

This is the mail Qeue Directory

Check the Configuration Once more:

myhostname = Centosserver.example.com
myorigin = $myhostname
inet_interfaces = all
#inet_interfaces = localhost
mynetworks = 168.100.189.0/28, 127.0.0.0/8, 192.168.0.0/24
mail_spool_directory = /var/spool/mail

Step 3:

Restart the Postfix Server

# /etc/init.d/postfix restart

step 5:

Add a user to check wether mail is working

[root@Centosserver ~]# useradd user1
[root@Centosserver ~]# passwd user1

step 6:

Send a mail from Root user to user1

To send a mail Just type as mail and then address were we need to send Type the Subject and Content and for sending the mail just put a .(dot) and press enter, mail will be send

eg :

[root@Centosserver ~]# mail user1@Centosserver.example.com
Subject: Linux Mental mail setup                           
Hi this is a test mail from Centosserver root user to user1 
.
EOT

Step 7:

su - user1

To check mail just type as mail, if so You will get like this below

Output:

[root@Centosserver ~]# su - user1
[user1@Centosserver ~]$ mail
Heirloom Mail version 12.4 7/29/08.  Type ? for help.
"/var/spool/mail/user1": 1 message 1 new
>N  1 root                  Thu Dec  5 18:27  18/687   "Linux Mental mail setup"
&

Choose 1 and press enter to read the mail

output:
From root@Centosserver.example.com  Thu Dec  5 18:27:50 2013
Return-Path: <root@Centosserver.example.com>
X-Original-To: user1@Centosserver.example.com
Delivered-To: user1@Centosserver.example.com
Date: Thu, 05 Dec 2013 18:27:50 +0530
To: user1@Centosserver.example.com
Subject: Linux Mental mail setup
User-Agent: Heirloom mailx 12.4 7/29/08
Content-Type: text/plain; charset=us-ascii
From: root@Centosserver.example.com (root)
Status: R

Hi this is a test mail from linux mental root user to user1

&

That's it...