Today I will show you the easiest way to relay E-Mail from a Linux server through GMail. There are several reasons why you would want to do this set up. One is if you server is running at home, because most mail servers that act as realy’s will block your home IP, because home black listed in The Spamhaus Project and other black lists. GMail is able to allow you sending mail because you are authenicationg with their server before they allow you to relay any mail. I will also include some helpfull instructions for CentOS users.
So first step is install ssmtp.
If you are running CentOS you will need to add the EPEL repositories, since SSMTP is not currently in the base package repository.
To install EPEL
# rpm -Uvh http://syslogserver.googlecode.com/files/epel-release-5-3.noarch.rpm # yum -y install ssmtp
Then we want to install SSMTP
#yum install ssmtp Loaded plugins: fastestmirror, refresh-packagekit Loading mirror speeds from cached hostfile * Webmin: download.webmin.com * base: mirror.linux.duke.edu * epel: mirror.symnds.com * extras: mirror.metrocast.net * updates: mirror.metrocast.net Setting up Install Process Resolving Dependencies -> Running transaction check -> Package ssmtp.i386 0:2.61-15.el5 will be installed -> Finished Dependency Resolution Dependencies Resolved ============================================================================================================================== Package Arch Version Repository Size ============================================================================================================================== Installing: ssmtp i386 2.61-15.el5 epel 52 k Transaction Summary ============================================================================================================================== Install 1 Package(s) Total download size: 52 k Installed size: 88 k Is this ok [y/N]: y Downloading Packages: ssmtp-2.61-15.el5.i386.rpm | 52 kB 00:00 Running rpm_check_debug Running Transaction Test Transaction Test Succeeded Running Transaction Installing : ssmtp-2.61-15.el5.i386 1/1 Installed: ssmtp.i386 0:2.61-15.el5 Complete! root@pbx:~ $
Now that SSMTP is install it is time to configure it.
# vi /etc/ssmtp/ssmtp.conf AuthUserfirstname.lastname@example.org AuthPass=GMail_password FromLineOverride=YES mailhub=smtp.gmail.com:587 UseSTARTTLS=YES
Modify the AuthUser and AuthPass to match your account information. The rest of the information can be kept the same.
Now make sure you do not have any other MTA running such as Postfix or Sendmail.
Now move the snedmail binary out of the way and link in the ssmtp binary so that it is used to send mail.
# mv /usr/sbin/sendmail /usr/sbin/no_runsendmail # ln -s /usr/sbin/ssmtp /usr/sbin/sendmail
Now you can test it with mailx
$ mailx email@example.com Subject: Test message body of test message . Cc: bab@three:~$
Now you should be receving a new E-Mail.