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sSMTP a Gmail sendmail relay replacement for Linux

Overview

sSMTP – a simple and lightweight MTA used to deliver mail from a computer to a mail hub (SMTP server) using Gmail SMTP servers.
Unlike Exim4, it does not receive mail, expand aliases, or manage a queue.

sSMTP a simple and lightweight MTA using Gmail SMTP servers

Requirements

First you need to stop sendmail if it is installed:

service sendmail stop
chkconfig sendmail off

Add the CentOS EPEL repository:

Download and install epel-release-6-8.noarch.rpm:

EPEL Current Version:

wget http://ftp.astral.ro/mirrors/fedora/pub/epel/6/i386/epel-release-6-8.noarch.rpm
rpm -Uvh epel-release-6-8.noarch.rpm
yum update

Install and Configure sSMTP

yum instal ssmtp

Edit /etc/ssmtp/ssmtp.conf:

FromLineOverride=YES
root=username@gmail.com
mailhub=smtp.gmail.com:587
UseTLS=YES
UseSTARTTLS=YES
AuthUser=username
AuthPass=we suggest creating an app password with gmail 2 step authentication.

Change to default MTA

Usually we ave sendmail as the main MTA, we need to change it:

alternatives --config mta

select /usr/sbin/sendmail.ssmtp.

Enjoy.

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