How to uninstall or remove dovecot-core software from Ubuntu

sudo apt-get remove dovecot-core

sudo apt-get remove --auto-remove dovecot-core
sudo apt-get purge dovecot-core
sudo apt-get purge --auto-remove dovecot-core

Install or Uninstall Postfix from Ubuntu Server

----------------------------

Installing Postfix Package

----------------------------

sudo apt update

sudo apt install postfix

----------------------------

Unnstalling Postfix Package

----------------------------

sudo apt remove postfix

sudo apt autoclean && sudo apt autoremove

How to Install RoundCube with Postfix, Dovecot, NGINX, MariaDB (or MySQL) on Ubuuntu-20.04

wget https://github.com/roundcube/roundcubemail/releases/download/1.4.11/roundcubemail-1.4.11-complete.tar.gz

tar xzf roundcubemail-1.4.11-complete.tar.gz

ls

sudo cp -r roundcubemail-1.4.11 var/www/html/roundcube

sudo chown -R www-data.www-data var/www/html/roundcube/

sudo chmod -R 775 var/www/html/roundcube/ [temp,logs]

mysql -u admin -p

Remove the Apache Web Server Ubuntu

sudo service apache2 stop

sudo systemctl disable apache2

sudo apt remove apache2

sudo apt autoremove

How to install Postal MTA using Docker & Caddy server in Ubuntu 18.04

Step-1: Hostname Setup

sudo hostname postal.example.com

Step-2: Docker

sudo apt-get update

sudo apt-get install \

    apt-transport-https \

    ca-certificates \

    curl \

    gnupg \

    lsb-release

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

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

sudo apt-get update

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

sudo curl -L "https://github.com/docker/compose/releases/download/1.29.2/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose

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

docker-compose --version

Step-3: System utilties

apt install git curl jq

Step-4: Git & installation helper repository

git clone https://postalserver.io/start/install /opt/postal/install

sudo ln -s /opt/postal/install/bin/postal /usr/bin/postal

Step-5: MariaDB

docker run -d \

   --name postal-mariadb \

   -p 127.0.0.1:3306:3306 \

   --restart always \

   -e MARIADB_DATABASE=postal \

   -e MARIADB_ROOT_PASSWORD=postal \

   mariadb

Step-6: RabbitMQ

docker run -d \

   --name postal-rabbitmq \

   -p 127.0.0.1:5672:5672 \

   --restart always \

   -e RABBITMQ_DEFAULT_USER=postal \

   -e RABBITMQ_DEFAULT_PASS=postal \

   -e RABBITMQ_DEFAULT_VHOST=postal \

   rabbitmq:3.8

Step-7: Installation postal

postal bootstrap mailer.justnutritive2.com

Step-8: DB Config and Permission (This is optional if you use step-5)

ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'password';

GRANT ALL ON postal.* TO 'postal'@'localhost' WITH GRANT OPTION;

FLUSH PRIVILEGES;

Exit;

sudo nano /opt/postal/config/postal.yml

Step-9: DB initialise

postal initialize

postal make-user

Step-10: Postal Running

postal start

Step-11: Installing WEB Client

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

Step-12: STPM Configure

https://postal.justnutritive2.com

-----------------------------------------

Postal Login Credentials

-----------------------------------------

Mr X.

https://postal.example.com/settings

Username: alexise@example.com

Password: **********

====================================================

docker run -d \

   --name postal-caddy \

   --restart always \

   --network host \

   -v /opt/postal/config/Caddyfile:/etc/caddy/Caddyfile \

   -v /home/postal/public_html/caddy-data:/data \

   caddy

sudo /etc/init.d/apache2 start

sudo /etc/init.d/apache2 stop

----------------------------

Postal stop

Postal start

Install only Webmin without Lamp Stack

$ sudo nano /etc/apt/sources.list

$ deb http://download.webmin.com/download/repository sarge contrib

$ wget http://www.webmin.com/jcameron-key.asc 

$ sudo apt-key add jcameron-key.asc

$ sudo apt update 

$ sudo apt install webmin

Change Ubuntu server Hoatname permanently

 Type the hostnamectl command :

sudo hostnamectl set-hostname newNameHere

Delete the old name and setup new name.

Next Edit the /etc/hosts file:

sudo nano /etc/hosts

Replace any occurrence of the existing computer name with your new one.

Reboot the system to changes take effect:

sudo reboot