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Install Send Mail on CentOS 6.4
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2: Stop unwamted Services or settings
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# /etc/init.d/NetworkManager stop
# chkconfig NetworkManager off
Note: Make sure you have configured Network i.e. (IP Address/Netmask/Gateway/DNS)
# /etc/init.d/postfix stop
# chkconfig postfix off
# vi /etc/sysconfig/selinux
SELINUX=disabled
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3: Upgrade Kernel Version
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yum update kernel
Reboot The Server
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4: Open Necessary Ports in iptables
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# vi /etc/sysconfig/iptables
-A INPUT -p tcp -m state --state NEW -m tcp --dport 25 -j ACCEPT
#/etc/init.d/iptables restart
#chkconfig iptables on
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5) Install Require Packages and dependencies and verify
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[root@mail-server ~]# yum install sendmail sendmail-cf
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6) Edit the file /etc/mail/sendmail.mc and add the following lines. Make sure you set
your mail server domain name where it's bolded:
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Most important part is to back up the MC macro file because that generates the CF file.
[root@mail-server ~]# cd /etc/mail
[root@mail-server ~]# cp sendmail.mc sendmail.mc.original
[root@mail-server ~]# cp sendmail.cf sendmail.cf.original
[root@mail-server ~]# vi /etc/mail/sendmail.mc
MASQUERADE_AS(yourdomain.com)dnl
MASQUERADE_DOMAIN(yourdomain.com)dnl
MASQUERADE_DOMAIN(alias.yourdomain.com)dnl
In the same file /etc/mail/sendmail.mc remove the "dnl" from the beginning of the lines so it will look like this:
LOCAL_DOMAIN(`localhost.localdomain')dnl
FEATURE(masquerade_envelope)dnl
FEATURE(masquerade_entire_domain)dnl
(May B line num 119,120,121)
DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')dnl
DAEMON_OPTIONS(`Port=smtp,Addr=xxx.xxx.x.x, Name=MTA')dnl
DAEMON_OPTIONS(`Port=smtp,Addr=xxx.xxx.xxx.xxx, Name=MTA')dnl
Note:
xxx.xxx.x.x = Your Local IP
xxx.xxx.xxx.xxx = Your Live IP
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7) Save the file and compile it using m4:
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[root@mail-server ~]# m4 /etc/mail/sendmail.mc > /etc/sendmail.cf
Send Sendmail a -HUP signal using kill or simply restart the daemon for the configuration changes to take effect:
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8: Save the file and compile it using m4:
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[root@mail-server ~]# service sendmail restart
Testing your configuration using sendmail
And that's it! you're done. Just send yourself a test email to make sure it is really working:
Check Sendmail Service is working or Not.
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[root@sendmail ]# ps ax|grep sendmail
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9129 ? Ss 0:00 sendmail: accepting connections
9138 ? Ss 0:00 sendmail: Queue runner@01:00:00 for /var/spool/clientmqueue
9163 pts/0 S+ 0:00 grep sendmail
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[root@sendmail ]# ps -aef |grep sendmail
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root 9129 1 0 16:20 ? 00:00:00 sendmail: accepting connections
smmsp 9138 1 0 16:20 ? 00:00:00 sendmail: Queue runner@01:00:00 for /var/spool/clientmqueue
root 9166 8444 0 16:22 pts/0 00:00:00 grep sendmail
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[root@sendmail ]# lsof -i :25
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COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
sendmail 9129 root 4u IPv4 23017 0t0 TCP localhost:smtp (LISTEN)
sendmail 9129 root 5u IPv4 23018 0t0 TCP sendmail:smtp (LISTEN)
Also check the maillogs if any errors.
[root@sendmail # tail -f /var/log/maillog
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9: Create a Mail User & set Password
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[root@mail-server ~]# useradd --create-home -s /sbin/nologin devendra; passwd
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10: Test Email with Following Script
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[root@mail-server ~]# /usr/sbin/sendmail -t < mail.txt
Where the contents of the mail.txt file are:
Date: Mon Jan 26 14:52:30 2015
To: you@somewhere.com
Subject: The subject of the message
From: whatever@somewhere.com Body of message goes here
[root@mail-server ~]# vi mail.txt
Date: Mon Jan 26 14:52:30 2015
To: devendra.joshi@linukstricks.com
Subject: Test Mail From Sendmail
From: devendra@linukstricks.com Body of message goes here
Also check the maillogs
[root@sendmail # tail -f /var/log/maillog
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END
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