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<\/a><\/figure>\n<\/div>Configuring the DNS server for an Ubuntu mail server<\/h2>
Just follow this step by step guide, and you shouldn’t have any problems setting up the configuration.<\/p>
1. Log in and update your server<\/h3>
Log into your server using SSH. If you’re having trouble, check out our PuTTY tutorial<\/a>. After logging in, you should update your machine using the following command:<\/p> To configure a DNS server that will use Postfix we’ll need an additional tool – Bind. Let’s install it first:<\/p> At this point, we must take into account that the example IP address in this tutorial is 123.123.123.123<\/strong> – you’ll need to replace it with the IP address where we will perform the installation. For this example we’ll use mail.example.com as a FQDNS.<\/p> So, now it is necessary to create a new zone for our example. To do this, create a new file with the zone information.<\/p> Then, add the following:<\/p> Remember, we must replace the IP address with that of your server, and change example.com<\/strong> to the domain you wish to use. Press CTRL+O<\/strong> to save the changes and CTRL+X<\/strong> to close the nano editor.<\/p> Before enabling the newly created zone it is necessary to check the configuration of the file.<\/p> Now we can add our new zone to the Bind zone configuration file. To do this, run the following command:<\/p> And add the new zone:<\/p> Again, CTRL+O<\/strong> to save the changes and CTRL+X<\/strong> to close it.<\/p> Now, in the file \/etc\/bind\/named.conf.options<\/strong> it is necessary to uncomment the forwarders line and include the Google DNS – 8.8.8.8<\/strong>. For that simply remove the \/\/<\/strong> symbols as shown in the screenshot below.<\/p> Now, we have to restart the bind9 service. You can do it with one of two commands:<\/p> or<\/p> We’re almost there, your Ubuntu email server is ready to come online. Here’s what you should do:<\/p> Now it is time to install Postfix. Postfix is an email server written in C. Its main feature is the speed of execution and open source nature. Install it with the following command:<\/p> During installation, we will be asked to configure the package. On the first screen, choose the option Internet Site.<\/p> Then, we have to enter the name of the server. In this case example.com<\/strong>.<\/p> Postfix is very flexible and allows extensive configuration, but for this tutorial we’ll fix with the default configuration.<\/p> Then, we have to add our user to the group mail:<\/p> After that, we have to create the users and add them to the mail group so they can send and receive mail. I’ll add Gabriel:<\/p> Then, we need to set a password to the newly created user:<\/p> Now to prove what we just did, we will send and receive an email from the terminal. To do this, we will install the mailutils package:<\/p> Next, we send an email to the other email account user named gabriel<\/strong>. Type in the subject and the message. After that, press CTRL+D<\/strong> to finish. To start writing an email enter the following command:<\/p> Now we can log into another user and check the mail utility.<\/p> There, after running the mail<\/strong> command, we will see the email we just sent to the other test user. To access the email just write the number of the mail, in this case, 1<\/strong>.<\/p> To test outbound emails from this user, just try another email address:<\/p> That’s it! You’re sending emails from your very own email server on Ubuntu. <\/p> An email server is easy to set up but might be a bit complex to manage. In Linux, it is recommended to do it for its security and resource management.<\/p> On the other hand, in a bigger company, it can be very useful to have a fully configured and functional email service out of the box, like the one offered by Hostinger<\/a>. Alternatively, host your own email server<\/a> to get complete control over the service.<\/p> There are many ways to improve and maintain an email server. It is a process that takes time and is constantly evolving, so we recommend that you keep going deeper into the subject. Good luck and happy mailing!<\/p> apt-get update<\/pre>
2. Install Bind<\/h3>
sudo apt install bind9<\/pre>
3. Configure \/var\/cache\/db.example<\/h3>
sudo nano \/var\/cache\/bind\/db.example<\/pre>
$ORIGIN example.com.
$TTL 1D
@ IN SOA ns1 root(
1 ;serial
1D ;refresh
2H ;retry
2W ;expire
5H ;minimum
);
@ IN NS ns1
ns1 IN A 123.123.123.123
mail IN A 123.123.123.123
@ IN MX 5 mail<\/pre>4. Add new zone to bind configuration<\/h3>
sudo named-checkzone example.com. \/var\/cache\/bind\/db.example<\/pre>
sudo nano \/etc\/bind\/named.conf.default-zones<\/pre>
zone \"example.com.\" {
type master;
file \"db.example\";
};<\/pre>5. Configure \/etc\/bind\/named.conf.options<\/h3>
sudo nano \/etc\/bind\/named.conf.options
![\"Editing](\"\/tutorials\/wp-content\/uploads\/sites\/2\/2019\/03\/editing-dns-zone.png\")
<\/pre>6. Restart Bind<\/h3>
sudo systemctl reload bind9<\/pre>
sudo systemctl restart bind9<\/pre>
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<\/a><\/figure>How to install and setup the mail server on Ubuntu<\/h2>
1. Install Postfix email server<\/h3>
sudo apt install postfix<\/pre>
2. Add user<\/h3>
sudo usermod -aG mail $(whoami)<\/pre>
sudo useradd -m -G mail -s \/bin\/bash\/ gabriel<\/pre>
sudo passwd gabriel<\/pre>
Test the Ubuntu mail server<\/h2>
sudo apt install mailutils<\/pre>
mail gabriel@example.com<\/pre>
mail angelo@example.com<\/pre>
Conclusion<\/h2>