Send email with Postfix in Ubuntu

As you know, to install a email server, you should install both Postfix and Dovecot, in this case it is quite complicated. In case you just need run sendmail function of Postfix, you should install PostFfix and config to relay to a SMTP server that you have. So in this article, I will show you steps to install and config it.

The scenario of this example as below:

You have a smtp server with configuration information as below

Firstly, install Postfix:

1	sudo apt-get install postfix

Open /etc/postfix/main.cf change some parameters as below:

myhostname = your_domain_here #eg: example.com

alias_maps = hash:/etc/aliases

alias_database = hash:/etc/aliases

mydestination = your_domain_here, localhost, localhost.localdomain

relayhost = url_smtp_server:port #e.g: smtp.example.com:25

smtp_sasl_auth_enable = yes

smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd

smtp_sasl_security_options = noanonymous

mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128

mailbox_size_limit = 0

And create /etc/postfix/sasl_passwd file and add content below

1	url_smtp_server:port username:password

Type below comand to create sasl_passwd.db:

1	sudo postmap /etc/postfix/sasl_passwd

Restart Postfix:

1	sudo /etc/init.d/postfix restart

Finally, test send email (make sure that you installed mail client):

1	echo "Test mail from postfix" \| mail -s "Test Postfix" your_email@gmail.com

You are done.

In case having errors, you can check log with command:

1	sudo tail -f /var/log/syslog

And now, you can write a php script, use Swiftmailer library to test send email via transport sendmail

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