How to Setup Postal Mail Server on Ubuntu 18.04

In today’s digital age, email communication is an essential 

part of any business operation. Email marketing is one of the most 

effective ways to reach a large audience and increase brand awareness. 

One critical component of an effective email marketing 

strategy is a reliable SMTP server. In this article, we will 

guide you through the process of building your own postal SMTP server, 

step by step.

build postal SMTP server

Table of Contents

What is a Postal SMTP Server?

Before getting into the specifics of creating your own SMTP server, let’s first define it and examine its operation. The standard system for transferring emails between servers on the internet is called SMTP, or Simple Mail Transfer system. It is the Work of an SMTP server to transmit and receive emails. Open-source email server software called Postal offers an SMTP and IMAP server that is quick and scalable for email sending and receiving.

Why Build Your Own SMTP Server?

Building your own SMTP server has several advantages over utilizing a third party service.                   the fact that you have complete control                                                                                                    over your email infrastructure means that you may customize it to suit your unique business requirements.By preserving your IP reputation, you may also save money on email service expenses and guarantee improved email delivery.

Prerequisites for Building a Postal SMTP Server

Before we start building our postal SMTP server, there are a few things we need to have in place:

  • A server or virtual machine (VM) running a Linux operating system
  • A public IP address for your server
  • A domain name for your email server
  • Basic knowledge of Linux command-line interface (CLI)

Installing Postal SMTP Server

Now that we have all the prerequisites in place let’s start building our postal SMTP server.

Step 1: Install Dependencies

Before we install Postal, we need to install its dependencies. Postal requires Node.js, Redis, and PostgreSQL. Here’s how you can install them:

  Name     	Type	Value
@	         A
mail	     A
rp.mail	     A
track.mail 	 A
psrp.mail   Cname	rp.mail.yoursite.com
mail	         MX	mail.yoursite.com ; 10
routes.mail MX	mail.yoursite.com ; 10
rp.mail  	MX	mail.yoursite.com ; 10
mail	    TXT	v=spf1 a mx include:spf.mail.yoursite.com ~all
rp.mail	    TXT	v=spf1 a mx include:spf.mail.yoursite.com ~all
spf.mail	TXT	v=spf1 ip4: ~all
_dmarc.mail TXT	v=DMARC1; p=none; fo=1; rua=mailto:info@yourdomain.com; ruf=mailto:info@yourdomain.com  

First of all switch to root user

  sudo apt-get update
sudo apt-get install apt-transport-https ca-certificates curl software-properties-common -y
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg  
Next, enter all the codes
echo \
  "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu \
  $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null  


  sudo apt-get update
sudo apt-get install docker-ce docker-ce-cli containerd.io
sudo curl -SL https://github.com/docker/compose/releases/download/v2.13.0/docker-compose-linux-x86_64 -o /usr/local/bin/docker-compose
sudo chmod +x /usr/local/bin/docker-compose
apt install git
apt install git curl jq
git clone https://postalserver.io/start/install /opt/postal/install
sudo ln -s /opt/postal/install/bin/postal /usr/bin/postal  

Install MariaDB

docker run -d \
   --name postal-mariadb \
   -p \
   --restart always \
   -e MARIADB_DATABASE=postal \
Install RabbitMQ
docker run -d \
   --name postal-rabbitmq \
   -p \
   --restart always \


  postal bootstrap postal.yourdomain.com
nano /opt/postal/config/postal.yml  

Now to edit postal.yml run the following command

  # The host that the management interface will be available on
  host: mail.edabosang.com
  # The protocol that requests to the management interface should happen on
  protocol: https
  # Specify configuration for the Postal web server
  port: 5000
  # Specify configuration to the Postal SMTP server
  port: 25
  # Specify options for the logging
  stdout: true
  # Specify the connection details for your MySQL database
  username: root
  password: postalpassword
  database: postal
  # Specify the connection details for your MySQL server that will be house the
  # message databases for mail servers.
  username: root
  password: postalpassword
  prefix: postal
  # Specify connection details for your RabbitMQ server
  username: postal
  password: password
  vhost: postalvhost
  # Specify the DNS records that you have configured. Refer to the documentation at
  # https://github.com/atech/postal/wiki/Domains-&-DNS-Configuration for further
  # information about these.
    - mail.edabosang.com
  smtp_server_hostname: mail.edabosang.com
  spf_include: spf.mail.edabosang.com
  return_path: rp.edabosang.com
  route_domain: routes.mail.edabosang.com
  track_domain: track.mail.edabosang.com
  # Specify an SMTP server that can be used to send messages from the Postal management
  # system to users. You can configure this to use a Postal mail server once the
  # your installation has been set up.
  port: 2525
  username: # Complete when Postal is running and you can
  password: # generate the credentials within the interface.
  from_name: Postal
  from_address: postal@edabosang.com
  # This is generated automatically by the config initialization. It should be a random
  # string unique to your installation.
  secret_key: b73a7e04571431c601d19a7688418eb395d059c1ada525dcfd337e978236be759e278367fb7c6773be625265d3d235ee98b4f8405957e4  

postal initialize

  postal initialize
postal make-user  

postal start

  postal start  

Install Caddy

docker run -d \
   --name postal-caddy \
   --restart always \
   --network host \
   -v /opt/postal/config/Caddyfile:/etc/caddy/Caddyfile \
   -v /opt/postal/caddy-data:/data \
  postal upgrade  



Learn how to set up a Postal SMTP server and efficiently send bulk emails step by step. Enhance your email marketing campaigns with ease

Send bulk emails reliably and efficiently with Postal SMTP server. Improve deliverability, gain insights with analytics, and customize configurations for optimal performance.

Effective Warm-Up for Email Sending

To warm up your email sending, start with a small engaged batch of recipients. Gradually increase volume while monitoring metrics closely. Maintain engagement and adapt based on feedback to establish a positive sender reputation and improve deliverability.


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