Making sure your server can email by itself

Before the emailing section lets see postfix first. What is Postfix? It is Wietse Venema’s mail server that started life at IBM research as an alternative to the widely-used Sendmail program.

This article will try to summarize the installation and configuration of the POSTFIX mail server to be able to send using SMTP of your server.

Here we will know how to install and configure the Postfix daemon on Ubuntu 18.04 will be explained. First Connect to your server using SSH connection with your username/password. Note you may have permission file to connect also

ssh root@serverip

Then do a apt-get update if you are on ubuntu then install postfix. make a sudo if rejected.

apt-get install postfix

You will see this screen. All Postfix configuration files are present in the / etc / postfix / folder. The two main files are and, although, for now, all you need to do is edit the file.

 choose “Internet Site”.

  • No configuration means the installation process will not configure any parameters.
  • Internet Site means using Postfix for sending emails to other MTAs and receiving emails from other MTAs.
  • Internet with smart host means using postfix to receive email from other MTAs, but using another smart host to relay emails to the recipient.
  • Satellite system means using smart host for sending and receiving emails.
  • Local only means emails are transmitted only between local user accounts.

The System mail name should be the same as the name you assigned to the server when you were creating it. just change it to your server name like When you’ve finished, press TAB, then ENTER.

Now POSTFIX is installed, the next step is to configure it. Run the following to know the status

service postfix status

Now the Domain Works

We have to register a mail server on our DNS setting. Add a A Record in DNS settings. Just add a name and IP of your server

A Record mailer XX.XXX.XX.XX

mailer can be anything like mail, mailme …. A mail server can be mailer.domain.anme will point to our postfix mail server

Also add a mx record for linking our mails to redirect to our mail server. Mails works in a different setting so we have to point to via MX DNS.

MX Record

This tells that mails for our domain will be handled by We could have just pointed to with the A Record but separation keeps the system more modular and easy to handle.

The DNS setting will take some time to reflect changes. Until that. just set our hostname to the FQDN like this

sudo hostnamectl set-hostname

Let try to send mail . Install mailutils to test email using our console

apt-get install mailutils

and send to someone email address

echo "Sent By This Server to Test POSTFIX" | mail -s "This is subject line Server Send Mail  "

And check your email id . In a few seconds you will get a mail

Now we have a mail but on SPAM. Since we have not verified our domain and other SPF stuff. That would be later. But we have a mail from our own server without 3rd party service. Sending mail is not limited to console, but you can use mail function via your PHP mail function to send also.