Installing SSMTP on CentOS 5.6

This tutorial will guide you through installing SSMTP on CentOS 5.6
SSMTP is an extremely simple MTA to get mail off the system to a mail hub. It contains no suid-binaries or other dangerous things – no mail spool to poke around in, and no daemons running in the background. Mail is simply forwarded to the configured mailhost. Extremely easy configuration. WARNING: the above is all it does; it does not receive mail, expand aliases or manage a queue.
Firstly lets install the EPEL repository as SSMTP is not native to CentOS 5.6 base installations.

Install the EPEL i386 Repo

# rpm -Uvh http://download.fedora.redhat.com/pub/epel/5/i386/epel-release-5-4.noarch.rpm

Remove Sendmail as the binaries can conflict.

# yum remove sendmail

Now install SSMTP

# yum install ssmtp

SSMTP is now installed and all that is let is to configure it.
For a really basic installation uncomment and replace with your mailserver and domain details mailhub and RewriteDomain

# cp /etc/ssmtp/ssmtp.conf /etc/ssmtp/ssmtp.conf.orig
# vi /etc/ssmtp/ssmtp.conf

#
# /etc/ssmtp.conf -- a config file for sSMTP sendmail.
#
# See the ssmtp.conf(5) man page for a more verbose explanation of the
# available options.
#
 
# The person who gets all mail for userids < 500
# Make this empty to disable rewriting.
root=postmaster
 
# The place where the mail goes. The actual machine name is required
# no MX records are consulted. Commonly mailhosts are named mail.domain.com
# The example will fit if you are in domain.com and your mailhub is so named.
mailhub=mail.how2centos.com
 
# Example for SMTP port number 2525
# mailhub=mail.your.domain:2525
# Example for SMTP port number 25 (Standard/RFC)
# mailhub=mail.your.domain
# Example for SSL encrypted connection
# mailhub=mail.your.domain:465
 
# Where will the mail seem to come from?
RewriteDomain=how2centos.com
 
# The full hostname
#Hostname=
 
# Set this to never rewrite the "From:" line (unless not given) and to
# use that address in the "from line" of the envelope.
#FromLineOverride=YES
 
# Use SSL/TLS to send secure messages to server.
#UseTLS=YES
 
# Use SSL/TLS certificate to authenticate against smtp host.
#UseTLSCert=YES
 
# Use this RSA certificate.
#TLSCert=/etc/pki/tls/private/ssmtp.pem
 
# Get enhanced (*really* enhanced) debugging information in the logs
# If you want to have debugging of the config file parsing, move this option
# to the top of the config file and uncomment
#Debug=YES

Installing SSMTP on CentOS 5.6