Build Postal SMTP Server & Send Bulk Emails Step by Step on Ubuntu 20.04

Postal-smtp-server

Building a Postal SMTP server to send bulk emails is a good choice for email marketers. Postal is very powerful and backed by a large community of developers. It is an open-source mail server script written in JavaScript and Ruby. It can be used to build in-house SMTP servers just like Mailgun, Sendgrid, Mailchimp, etc.

Postal installation is not very straightforward. The process is fairly complex. It’s because Postal needs several packages to be installed beforehand, it can be used. I have tried to make it as simple as possible.

Requirement for Postal SMTP server

  • A domain name from Namecheap or Namesilo
  • A VPS or cloud with a minimum of 4 GB RAM and 2 vCPU
  • Operating System: Ubuntu 20.04 or Ubuntu 18.04 or CentOS 7

I am using Contabo for the purpose of demonstration.

Initial Setup

In order to start with installation, you will need to connect to the server. If you are on you have to get an SSH client for this purpose. One such SSH client is Putty. But if you are on Linux or Mac, just open the terminal and type ssh@xx.x.x.xxx where xx.x.x.xxx is your server IP address.

First of all switch to root user

sudo -i

After that update and upgrade your Ubuntu

apt update -y
apt upgrade -y

Next setup hostname. Replace “inlearn.in” with your domain name.

hostnamectl set-hostname mail.inlearn.in

Updating DNS records

Login to the domain registrar and create A record for mail.yourdomain.com

Now let’s begin with the installation.

Note: This is a new installation guide. If you are looking for an old installation guide scroll down.

Installing Docker and Docker-Compose

Recently postal team switched to docker mode to make installation easier for the end-users. Therefore we need to install Docker and Docker-Compose first. I already have discussed what is docker, docker-compose & installation steps in detail. Feel free to read the article to have a clear understanding of docker.

Installing Docker

First of all, set a few packages to set up the Docker repository

sudo apt-get install apt-transport-https ca-certificates curl software-properties-common -y

Next, add Docker’s official GPG key.

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg

Now, you can install the Docker repository using the following commands

echo \
  "deb [arch=amd64 signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu \
  $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

Next update the system software

sudo apt-get update -y

Finally, run the following command to install Docker Engine and containerd.

sudo apt-get install docker-ce docker-ce-cli containerd.io

Installing Docker-Compose

First of all download the current stable release of Docker Compose:

sudo curl -L "https://github.com/docker/compose/releases/download/1.29.1/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose

Next, update the permission to binary

sudo chmod +x /usr/local/bin/docker-compose

Finally, test the docker-compose installation

docker-compose --version

You will see the docker-compose version. If you see anything else this means something has gone wrong.

Installing Additional Prerequisites for Postal SMTP

After installation of Docker and Docker-compose, you need to install a few other packages like Git, MariaDB, RabbitMQ, etc.

So, let’s install them one by one.

First, install git and git curl

apt install git -y
apt install git curl jq

Next clone the postal helper repository

git clone https://postalserver.io/start/install /opt/postal/install
sudo ln -s /opt/postal/install/bin/postal /usr/bin/postal

Installing MariaDB

Now, you can install MariaDB in the docker container

docker run -d \
   --name postal-mariadb \
   -p 127.0.0.1:3306:3306 \
   --restart always \
   -e MARIADB_DATABASE=postal \
   -e MARIADB_ROOT_PASSWORD=postalpassword \
   mariadb

Installing RabbitMQ

RabbitMQ is necessary to process messages and distribute the loads

To install it, run the following commands

docker run -d \
   --name postal-rabbitmq \
   -p 127.0.0.1:5672:5672 \
   --restart always \
   -e RABBITMQ_DEFAULT_USER=postal \
   -e RABBITMQ_DEFAULT_PASS=password \
   -e RABBITMQ_DEFAULT_VHOST=postalvhost \
   rabbitmq:3.8

Now we have installed all the prerequisite packages, it’s time to install Postal

Installing Postal

The postal repository, you installed earlier, is capable of generating some configuration files to use

Run the following command. 

postal bootstrap mail.inlearn.in

The above command generates 3 files. Out of which postal.yml is of our interest.

You need to edit the postal.yml and make changes. But before that install an editor. I suggest installing nano.

apt install nano -y

Now to edit postal.yml run the following command

nano /opt/postal/config/postal.yml

You will see output something like this

  # The host that the management interface will be available on
  host: mail.inlearn.in
  # The protocol that requests to the management interface should happen on
  protocol: https

web_server:
  # Specify configuration for the Postal web server
  bind_address: 172.105.33.83
  port: 5000

smtp_server:
  # Specify configuration to the Postal SMTP server
  port: 25

logging:
  # Specify options for the logging
  stdout: true

main_db:
  # Specify the connection details for your MySQL database
  host: 127.0.0.1
  username: root
  password: postal
  database: postalpassword

message_db:
  # Specify the connection details for your MySQL server that will be house the
  # message databases for mail servers.
  host: 127.0.0.1
  username: root
  password: postalpassword
  prefix: postal

rabbitmq:
  # Specify connection details for your RabbitMQ server
  host: 127.0.0.1
  username: postal
  password: password
  vhost: postalvhost

dns:
  # 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.
  mx_records:
    - mail.inlearn.in
  smtp_server_hostname: mail.inlearn.in
  spf_include: spf.mail.inlearn.in
  return_path: rp.mail.inlearn.in
  route_domain: routes.mail.inlearn.in
  track_domain: track.mail.inlearn.in

smtp:
  # 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.
  host: 127.0.0.1
  port: 2525
  username: # Complete when Postal is running and you can
  password: # generate the credentials within the interface.
  from_name: Postal
  from_address: postal@inlearn.in

rails:
  # This is generated automatically by the config initialization. It should be a random
  # string unique to your installation.
  secret_key: b73a7e04571431c601d19a7688418eb395d059c1ada525dcfd337e978236be759e278367fb7c6773be625265d3d235ee98b4f8405957e4bbd1c4001f367442bf531843f690a1918626179bf297e31d5cd268c2f33339afd19b17ce901a3832bb9a8107f04bf1b702a4da16096141ed5c46cee3f739d3adabf89fa3cfd91f00cf

Cross-check your config file and then save and close the file with CTRL + X.

Initializing Database

Initializing Database is super easy, just execute the following command and you will see database tables were getting created in the output.

postal initialize

After that, it’s time to build postal

postal make-user

You will be asked for the email id, name, and password of the admin user. Type the answer and then go to the next step.

Starting & Running Postal

Starting and running postal is also super easy. Just run the following command.

postal start

You can check the status of postal

postal status

Installing Caddy

This is a new feature added by the Postal team to install SSL automatically.

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

Now you can go to http://mail.yourdomain.com:5000 and log in using admin credentials. You will see the admin page something like this.

Postal-login-screen

In, the next article we will learn to create an organization, domain management, SMTP creation, etc.

##########################################################################################

Old installation guide

Installation and Configuration of MariaDB

First of all, install the MariaDB database on your server. 

apt-get install mariadb-server libmysqlclient-dev -y

After installing MariaDB, it’s time to do some configuration to MariaDB

mysql_secure_installation

Answer all the questions as shown below:

    Enter current password for root (enter for none):
    Set root password? [Y/n]: N
    Remove anonymous users? [Y/n]: Y
    Disallow root login remotely? [Y/n]: Y
    Remove test database and access to it? [Y/n]:  Y
    Reload privilege tables now? [Y/n]:  Y

Next login to MariaDB to create mysql database

mysql -u root -p

Enter your root password, then create a database and user for Postal. Here I am creating database name “postal” and database user “postaluser”. Also, replace postaluser password “your_password” with a password of your choice.

CREATE DATABASE postal CHARSET utf8mb4 COLLATE utf8mb4_unicode_ci;
CREATE USER 'postaluser'@'localhost' IDENTIFIED BY 'your_password';

Next, grant all the privileges to the postal database:

GRANT ALL ON postal.* TO 'postaluser'@'localhost';
GRANT ALL PRIVILEGES ON `postal-%`.* to `postaluser`@`localhost` IDENTIFIED BY "password";

After that save and exit from the MariaDB shell

FLUSH PRIVILEGES;
QUIT;

Installing Ruby

It’s time to install Ruby on the server. By default, Ruby is not available in the Ubuntu 18.04 default repository. Therefore, we need to add Ruby repository first.

apt-get install software-properties-common -y
apt-add-repository ppa:brightbox/ruby-ng

Next, update the repository and install the Ruby.

apt-get update -y
apt-get install ruby2.6 ruby2.6-dev build-essential -y

Install RabbitMQ

Now we need to install RabbitMQ for message queueing. For that, we need to install few dependencies. 

apt-get install curl gnupg debian-keyring debian-archive-keyring apt-transport-https -y

Add signing keys and few repositories

sudo apt-key adv --keyserver "hkps://keys.openpgp.org" --recv-keys "0x0A9AF2115F4687BD29803A206B73A36E6026DFCA"
curl -1sLf https://dl.cloudsmith.io/public/rabbitmq/rabbitmq-erlang/gpg.E495BB49CC4BBE5B.key | apt-key add -
curl -1sLf https://dl.cloudsmith.io/public/rabbitmq/rabbitmq-server/gpg.9F4587F226208342.key | apt-key add -

Now we need to add apt repositories maintained by Team RabbitMQ

sudo tee /etc/apt/sources.list.d/rabbitmq.list <<EOF
deb https://dl.cloudsmith.io/public/rabbitmq/rabbitmq-erlang/deb/ubuntu bionic main
deb-src https://dl.cloudsmith.io/public/rabbitmq/rabbitmq-erlang/deb/ubuntu bionic main
deb https://dl.cloudsmith.io/public/rabbitmq/rabbitmq-server/deb/ubuntu bionic main
deb-src https://dl.cloudsmith.io/public/rabbitmq/rabbitmq-server/deb/ubuntu bionic main
EOF

After that update the repository and install Erlang.

apt-get update -y
apt-get install -y erlang-base \
                        erlang-asn1 erlang-crypto erlang-eldap erlang-ftp erlang-inets \
                        erlang-mnesia erlang-os-mon erlang-parsetools erlang-public-key \
                        erlang-runtime-tools erlang-snmp erlang-ssl \
                        erlang-syntax-tools erlang-tftp erlang-tools erlang-xmerl

At last, install RabbitMQ.

apt-get install rabbitmq-server -y --fix-missing

Now we have RabbitMQ installed, let’s check the status of RabbitMQ

systemctl status rabbitmq-server

After that we need to create RabbitMQ vhost and user for postal. Simply run the following command:

rabbitmqctl add_vhost /postal
rabbitmqctl add_user postal password
rabbitmqctl set_permissions -p /postal postal ".*" ".*" ".*"

Installing Nodejs

By default, the latest version of Nodejs is not available in the Ubuntu 18.04 default repository. Therefore, add the repository for that first.

curl -sL https://deb.nodesource.com/setup_12.x | bash

Next install it.

apt-get install nodejs -y

Installing Postal

Before installing Postal, you will need to create a user for postal mail server on Ubuntu.

useradd -r -m -d /opt/postal -s /bin/bash postal

Now, enable ruby to listen on web ports.

setcap 'cap_net_bind_service=+ep' /usr/bin/ruby2.6

After that, install all the required gems with the following command:

gem install bundler

Next, install procodile with gem:

gem install procodile

Finally, install nokogiri with gem:

gem install nokogiri -v '1.7.2'

Install git with the following command

apt install git -y

Now, create a directory structure for Postal. Here all the files will be kept related to Postal

mkdir -p /opt/postal/app

It’s time to download the latest version of Postal.

wget https://postal.atech.media/packages/stable/latest.tgz

Once the download is completed, extract the downloaded file with the following command:

tar zpxvf latest.tgz -C /opt/postal/app

Next, change ownership of postal directory.

chown -R postal:postal /opt/postal

Now, create a symlink for Postal binary

ln -s /opt/postal/app/bin/postal /usr/bin/postal

After that, install all the required dependencies with the following command:

postal bundle /opt/postal/vendor/bundle

If above steps fails and you get the error, then execute the following command. This error is because mimemagic got updated.

cd /opt/postal/app
bundle update mimemagic
bundle install
cd ~

Next, generate Postal Configuration files with the following command:

postal initialize-config

Now, open Postal configuration file and edit it to reflect correct information:

nano /opt/postal/config/postal.yml

Make the following changes as per your environment:

web:
  host: postal.example.com
  # The protocol that requests to the management interface should happen on
  protocol: https

main_db:
  # Specify the connection details for your MySQL database
  host: localhost
  username: postal
  password: password
  database: postal

message_db:
  # Specify the connection details for your MySQL server that will be house the
  # message databases for mail servers.
  host: localhost
  username: postal
  password: password
  prefix: postal

rabbitmq:
  # Specify the connection details for your RabbitMQ server.
  host: 127.0.0.1
  username: postal
  password: password
  vhost: /postal
  
dns:
  # Specifies the DNS record that you have configured. Refer to the documentation at
  # https://github.com/atech/postal/wiki/Domains-&-DNS-Configuration for further
  # information about these.
  mx_records:
    - mx.postal.example.com
  smtp_server_hostname: postal.example.com
  spf_include: spf.postal.example.com
  return_path: rp.postal.example.com
  route_domain: routes.postal.example.com
  track_domain: track.postal.example.com

smtp:
  # 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.
  host: 127.0.0.1
  port: 2525
  username: # Complete when Postal is running and you can
  password: # generate the credentials within the interface.
  from_name: Postal
  from_address: postal@yourdomain.com

Save and close the file with CTRL + X. Then, initialize database with the following command:

postal initialize

Next, you will need to create a admin user for Postal. 

postal make-user

Answer all the questions as shown below:

Postal User Creator
Enter the information required to create a new Postal user.
This tool is usually only used to create your initial admin user.

E-Mail Address      : admin@example.com
First Name          : Admin
Last Name           : Postal
Initial Password:   : *********

User has been created with e-mail address admin@example.com

Finally, start the Postal application.

postal start

Now, check the status of Postal

postal status

Just in case, if you like to stop postal service, you can do so by

postal stop

Create Systemd Service file for Postal

Next, you will need to create a systemd service file to manage Postal service. This can be done with the following command:

nano /etc/systemd/system/postal.service

Add the following lines:

[Unit]
Description=Postal Mail Platform
After=mysql.service rabbitmq-server.service
Wants=mysql.service rabbitmq-server.service

[Service]
ExecStart=/usr/bin/postal start
ExecStop=/usr/bin/postal stop
ExecReload=/usr/bin/postal restart
User=postal
Restart=on-failure
Type=forking

[Install]
WantedBy=mysql.service rabbitmq-server.service

Save and close the file. Then, reload the systemd with the following command:

systemctl daemon-reload

Next, start Postal service and enable it to start on boot with the following command:

systemctl start postal 
systemctl enable postal

You can check the status of Postal service with the following command:

systemctl status postal

Install and Configure Nginx

Next, you will need to install Nginx to access Postal mail server. First, install Nginx with the following command:

apt-get install nginx openssl -y

Next, copy Nginx configuration file with the following command:

cp /opt/postal/app/resource/nginx.cfg /etc/nginx/sites-available/default

Next, create a self-signed SSL certificate with the following command:

mkdir /etc/nginx/ssl/
openssl req -x509 -newkey rsa:4096 -keyout /etc/nginx/ssl/postal.key -out /etc/nginx/ssl/postal.cert -days 365 -nodes

Answer all the questions as shown below:

Generating a 4096 bit RSA private key
...............................++
.................++
writing new private key to '/etc/nginx/ssl/postal.key'
-----
You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,
If you enter '.', the field will be left blank.
-----
Country Name (2 letter code) [AU]:IN
State or Province Name (full name) [Some-State]:Bihar
Locality Name (eg, city) []:Patna
Organization Name (eg, company) [Internet Widgits Pty Ltd]:IT
Organizational Unit Name (eg, section) []:IT
Common Name (e.g. server FQDN or YOUR name) []:Dhiraj
Email Address []:admin@example.com

Next, open the Nginx default virtual host file and define your domain:

nano /etc/nginx/sites-available/default

Here, you need to make the following changes:

server_name postal.example.com;

Save and close the file. After that, restart Nginx service with the following command:

systemctl restart nginx

Access Postal Web Interface

Now, open your web browser and type the URL https://mail.yourdomain.com. You will be redirected to the admin page. Login with email id and password.

Postal-login-screen

After that, you will postal dashboard.

postal-dashboard

In, next article we will learn to create organization, domain management and SMTP creation, etc.

Video Lesson

Conclusion

Installing Postal is somewhat complex procedure. Nonetheless, it’s worth to give it a try considering the Postal features.

/62 Comments/by
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62 replies
      • Clement Godswill
        Clement Godswill says:

        Thanks for your reply. I bought several ips from contabo. I have followed your video and install postal successfuly. I have tried to Build a new mail server in postal, after adding a server name, I click on the build server button, it was just loading and loading without building any server. I can give you my postal login details, so you can see that my postal cannot build mail server

        Reply
          • Partha
            Partha says:

            Hi Sir
            I have the same error where I install postal also create organization successfully where i try to build a mail server just loading and loading. i have already check yml config file but don’t get any error but in postal status, i receive the below status msg, Please help

            postal_cron_1 /docker-entrypoint.sh post … Up
            postal_requeuer_1 /docker-entrypoint.sh post … Up
            postal_smtp_1 /docker-entrypoint.sh post … Exit 1
            postal_web_1 /docker-entrypoint.sh post … Up
            postal_worker_1 /docker-entrypoint.sh post … Up

  3. Jozef
    Jozef says:

    Why do you think i got this error?sudo apt-get install ruby2.3 ruby2.3-dev build-essential -y
    Reading package lists… Done
    Building dependency tree
    Reading state information… Done
    Package ruby2.3 is not available, but is referred to by another package.
    This may mean that the package is missing, has been obsoleted, or
    is only available from another source

    Package ruby2.3-dev is not available, but is referred to by another package.
    This may mean that the package is missing, has been obsoleted, or
    is only available from another source

    E: Package ‘ruby2.3’ has no installation candidate
    E: Package ‘ruby2.3-dev’ has no installation candidate

    Reply
  4. Jozef
    Jozef says:

    I got this error again when using this commend:
    sudo gem install nokogiri -v ‘1.7.2’
    Building native extensions. This could take a while…
    ERROR: Error installing nokogiri:
    ERROR: Failed to build gem native extension.

    current directory: /var/lib/gems/2.7.0/gems/nokogiri-1.7.2/ext/nokogiri
    /usr/bin/ruby2.7 -I /usr/lib/ruby/2.7.0 -r ./siteconf20210424-238639-mr7f7o.rb extconf.rb
    checking if the C compiler accepts … yes
    Building nokogiri using packaged libraries.
    Using mini_portile version 2.1.0

    Reply
  5. David
    David says:

    After that, install all the required dependencies with the following command:

    1. postal bundle /opt/postal/vendor/bundle

    “Could not find mail-2.7.2.edge in any of the sources”

    Please help me

    Reply
  6. Sandi
    Sandi says:

    Hi, thank you for your tutorials.

    I successfully install and use postal to send email from mautic via smtp (mautic on separated vps).

    But there is one problem left, i already use 8gb ram vps and the sending speed only around 50 emails/minute.

    I already increase the postal worker and do some mysql tuning that I found on postal github.

    Is there anything I could do to fix this? At least i need 500 emails/minute rate. I see on github there is a person who could send 300 emails/min with 4gb vps. So in my opinion I could get better performance.

    Before this I am using amazon ses via smtp with same mautic and there is no problem with sending speed rate.

    Thank you.

    Reply
  7. Ravi
    Ravi says:

    postal make-user gives this error, how to solve this pl.

    1: from /opt/postal/vendor/bundle/ruby/2.6.0/gems/mysql2-0.5.3/lib/mysql2/client.rb:90:in `initialize’
    /opt/postal/vendor/bundle/ruby/2.6.0/gems/mysql2-0.5.3/lib/mysql2/client.rb:90:in `connect’: Access denied for user ‘postal’@’localhost’ (using password: YES) (Mysql2::Error::ConnectionError)

    Reply
  8. Truong
    Truong says:

    I really love your article. Very nice!
    I have a question:
    I can only access my Postal server by using ‘http//:mail.mydomain.com:5000’ instead of the correct way is ‘https://mail.mydomain.com’ as your guide.
    Kindly help me with how to fix it?
    Thanks a lot!

    Reply
  9. moises
    moises says:

    Hi, i have one error, when i run postal initialize i got this error:
    Access denied for user ‘root’@’172.xx.xx.xx’ (using password: YES)
    Couldn’t create ‘postal’ database. Please check your configuration.

    Any idea how to solve this? iim using ubuntu 18.04

    Thanks

    Reply
  10. Francisco Ubieto
    Francisco Ubieto says:

    Hi Dhiraj,
    Thank you or the tutorials, I’ve followed it but run into trouble installing MariaDB

    Can’t connect to MySQL server on ‘127.0.0.1’ (115)
    Couldn’t create ‘postal’ database. Please check your configuration.
    rake aborted!
    and
    ERROR 1045 (28000): Access denied for user ‘root’@’localhost’ (using password: YES)

    I’ve tried uninstalling and installing, resetting the server, changing from ubuntu 18.04 to 20.0, using the old method and the new with docker…
    so far nothing works and my frustration is at an all-time high !!!

    the worst part is that I had the old version of Postal working but decided to update.
    I sent a private email, I hope you can help.
    Thanks.

    Reply
  12. Roy Colboure
    Roy Colboure says:

    Access denied for user ‘root’@’172.17.0.1’ (using password: YES)
    Couldn’t create ‘postal’ database. Please check your configuration.
    rake aborted!
    Mysql2::Error::ConnectionError: Access denied for user ‘root’@’172.17.0.1’ (using password: YES)

    pls i tried to do postal initialize, i keep getting this error every time, pls can you help me resolve it. Thanks

    Reply
  13. Roy Colboure
    Roy Colboure says:

    Access denied for user ‘root’@’172.17.0.1’ (using password: YES)
    Couldn’t create ‘postal’ database. Please check your configuration.
    rake aborted!
    Mysql2::Error::ConnectionError: Access denied for user ‘root’@’172.17.0.1’ (using password: YES)

    Hey Guru,
    i got this error message while trying to do postal initialize, please how can you help me solve it.
    Thanks

    Reply
  15. Iswor Lal Shrestha
    Iswor Lal Shrestha says:

    Hello, I am trying to install SMTP server as per your guideline. But I was stuck in install rabbitmq server. Can you please guide me on this section. Every time I am getting error for this step. Error: The repository is not signed.
    Looking forward to hearing from you.

    Thanks

    Reply
  16. Iswor Lal Shrestha
    Iswor Lal Shrestha says:

    postal_smtp_1 and postal_worker_1 always stop as soon as I start it. I install the postal v2. postal_web_1 is now running and hope it will run all the time. What could be the solution? Looking forward to hearing from you.

    Thanks

    Reply
  17. Iswor Lal Shrestha
    Iswor Lal Shrestha says:

    When I checked the postal logs, I got the error message as below:

    bundler: failed to load command: puma (/usr/local/bundle/bin/puma)
    Errno::EADDRNOTAVAIL: Cannot assign requested address – bind(2) for “172.105.33.83” port 5000

    How the above error can be solved?

    Looking forward to hearing from you.
    Thanks

    Reply
  18. CSCforMe
    CSCforMe says:

    Hi,
    I would like to install Mautic 4 and Postal on the same VPS. Any install guides to point me in the right direction?

    Reply
  19. greg
    greg says:

    Hello,

    thank you so much for the value of your content.

    I have been following the process and got stuck at the part where I need to bootstrap to mail.yourdomain.com.

    Putty tells me ” can’t connect to mail.mydomain.com ”

    Any idea where this comes from ? i though it was DNS pointing wrong but everything seems to be fine.

    I would appreciate if you could help figuring out where the problem comes from.

    Reply
  21. zeeshan
    zeeshan says:

    Hello,
    Getting below error when running postal initialize command.
    root@postal:~# postal initialize
    Pulling web … done
    Pulling smtp … done
    Pulling worker … done
    Pulling cron … done
    Pulling requeuer … done
    Creating postal_runner_run … done
    Initializing database
    No secret key was specified in the Postal config file. Using one for just this session
    Access denied for user ‘postal’@’172.17.0.1’ (using password: NO)
    Couldn’t create ‘postal’ database. Please check your configuration.
    rake aborted!
    Mysql2::Error::ConnectionError: Access denied for user ‘postal’@’172.17.0.1′ (using password: NO)
    /usr/local/bundle/gems/mysql2-0.5.3/lib/mysql2/client.rb:90:in `connect’
    /usr/local/bundle/gems/mysql2-0.5.3/lib/mysql2/client.rb:90:in `initialize’
    /usr/local/bundle/gems/activerecord-5.2.6/lib/active_record/connection_adapters/mysql2_adapter.rb:22:in `new’
    /usr/local/bundle/gems/activerecord-5.2.6/lib/active_record/connection_adapters/mysql2_adapter.rb:22:in `mysql2_connection’
    /usr/local/bundle/gems/activerecord-5.2.6/lib/active_record/connection_adapters/abstract/connection_pool.rb:830:in `new_connection’
    /usr/local/bundle/gems/activerecord-5.2.6/lib/active_record/connection_adapters/abstract/connection_pool.rb:874:in `checkout_new_connection’
    /usr/local/bundle/gems/activerecord-5.2.6/lib/active_record/connection_adapters/abstract/connection_pool.rb:853:in `try_to_checkout_new_connection’
    /usr/local/bundle/gems/activerecord-5.2.6/lib/active_record/connection_adapters/abstract/connection_pool.rb:814:in `acquire_connection’
    /usr/local/bundle/gems/activerecord-5.2.6/lib/active_record/connection_adapters/abstract/connection_pool.rb:538:in `checkout’
    /usr/local/bundle/gems/activerecord-5.2.6/lib/active_record/connection_adapters/abstract/connection_pool.rb:382:in `connection’
    /usr/local/bundle/gems/activerecord-5.2.6/lib/active_record/connection_adapters/abstract/connection_pool.rb:1033:in `retrieve_connection’
    /usr/local/bundle/gems/activerecord-5.2.6/lib/active_record/connection_handling.rb:118:in `retrieve_connection’
    /usr/local/bundle/gems/activerecord-5.2.6/lib/active_record/connection_handling.rb:90:in `connection’
    /usr/local/bundle/gems/activerecord-5.2.6/lib/active_record/tasks/mysql_database_tasks.rb:6:in `connection’
    /usr/local/bundle/gems/activerecord-5.2.6/lib/active_record/tasks/mysql_database_tasks.rb:14:in `create’
    /usr/local/bundle/gems/activerecord-5.2.6/lib/active_record/tasks/database_tasks.rb:119:in `create’
    /usr/local/bundle/gems/activerecord-5.2.6/lib/active_record/tasks/database_tasks.rb:139:in `block in create_current’
    /usr/local/bundle/gems/activerecord-5.2.6/lib/active_record/tasks/database_tasks.rb:316:in `block in each_current_configuration’
    /usr/local/bundle/gems/activerecord-5.2.6/lib/active_record/tasks/database_tasks.rb:313:in `each’
    /usr/local/bundle/gems/activerecord-5.2.6/lib/active_record/tasks/database_tasks.rb:313:in `each_current_configuration’
    /usr/local/bundle/gems/activerecord-5.2.6/lib/active_record/tasks/database_tasks.rb:138:in `create_current’
    /usr/local/bundle/gems/activerecord-5.2.6/lib/active_record/railties/databases.rake:29:in `block (2 levels) in ‘
    /opt/postal/app/bin/bundle:3:in `load’
    /opt/postal/app/bin/bundle:3:in `’
    Tasks: TOP => db:create
    (See full trace by running task with –trace)
    ERROR: 1
    can anyone help

    Reply
  24. Gregory
    Gregory says:

    I configured the SMTP using Postal.
    When I sent a test the email the email(s) stays in the queue and it gave me this error.:

    SMTP send error
    Failure sending mail.
    Unable to read data from the transport connection: The connection was closed.

    How do I remedy?

    Reply
  25. Mourad Baaqqa
    Mourad Baaqqa says:

    Hi,
    Can you please let me know if there is an advantage of getting a server with multipe IP addresses ?
    Can a single server use different domains for each of these IP addresses ?
    This could help instead of installing multiple servers

    Thanks in advance

    Reply
      • Mourad Baaqqa
        Mourad Baaqqa says:

        thanks very much for your feedback.
        The question is, Can Postal handle this, like use many IP addresses and many domains and rotate IP and Domains so that it will reduce the risk of being blacklisted?
        Thanks again

        Reply
  27. Indra Kumar
    Indra Kumar says:

    Using docker method, after using mariadb and rabbitmq, im getting an error of “invalid reference format”.

    Im using putty v0.77(64bit), digitalocean ubuntu 20.04

    pls help

    Reply

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