Mail Server Configuration Using sendmail

Step 1 : Install the packages for mail server

[root#] yum install sendmail*
[root#] yum install procmail*
[root#] yum install m4*

Step 2 :  Verify the packages
[root#] rpmquery -qa | grep sendmail
o/p:
sendmail-8.14.4-8.el6.i686
sendmail-cf-8.14.4-8.el6.noarch


Step 3  : Check the hostname
[root#] hostname
o/p:
server.tyit.com

Step 4 :  Get the IP Address
[root#] ifconfig
o/p:
192.168.2.112 


Step 5 : Open the Macro file of sendmail   "/etc/mail/sendmail.mc"
Line No : 116
DAEMON_OPTIONS('port=smtp,Addr=127.0.0.1,name=MTA')dnl
Put "dnl #" in the beginning of the line
dnl  #  DAEMON_OPTIONS('port=smtp,Addr=127.0.0.1,name=MTA')dnl

** Save the file and come back to terminal

Step 6 : Convert the macro file in configuration file
[root#] m4    /etc/mail/sendmail.mc   >   /etc/mail/sendmail.cf

Step 7 :  Open the /etc/hosts
Add last the line
127.0.0.1       server.tyit.com

** Save the file and come back to terminal


Step 8 :  Stop the firewall
[root#] service iptables stop

Step 9  : Turn off Linux Security
[root#] setenforce 0

Step 10. Start and restart the sendmail service
[root#] service sendmail start
[root#] serivce sendmail restart

Step 11 :  Add a user "testB"
[root#] useradd testB

Step 12 : Allocate password to the user
[root#] passwd testB
o/p:
Changing password for user testB.
New password: (123)
Retype new password: (123)
passwd: all authentication tokens updated successfully.


Step 13 : Check the hostname
[root#] hostname
server.tyit.com

Step 14 : Sending a mail to user "testB"
[root#] mail   testB@server.tyit.com
o/p:
Subject: Testmail
Hi m testing the mail
[CTRL + D]
EOT

Step 15 : 
[root#] chkconfig sendmail on
[root#] service sendmail restart