What is Docker Mailserver?
[Docker Mailserver is a] production-ready fullstack but simple mail server (SMTP, IMAP, LDAP, Antispam, Antivirus, etc.). Only configuration files, no SQL database. Keep it simple and versioned. Easy to deploy and upgrade. - https://github.com/docker-mailserver/docker-mailserver
Installing Docker
Log into the Linux host and run the following commands in a terminal window
# update software repositories sudo apt update # install prerequisites sudo apt install apt-transport-https ca-certificates curl software-properties-common gnupg-agent -y # add docker gpg key curl -fsSL https://download.docker.com/linux/$(awk -F'=' '/^ID=/{ print $NF }' /etc/os-release)/gpg | sudo apt-key add - # add docker software repository sudo add-apt-repository "deb [arch=$(dpkg --print-architecture)] https://download.docker.com/linux/$(awk -F'=' '/^ID=/{ print $NF }' /etc/os-release) $(lsb_release -cs) stable" # install docker sudo apt install docker-ce docker-compose containerd.io -y # enable and start docker service sudo systemctl enable docker && sudo systemctl start docker # add the current user to the docker group sudo usermod -aG docker $USER # reauthenticate for the new group membership to take effect su - $USER
Running Docker Mailserver Container
Continue with the following commands in a terminal window
# create main working directories mkdir ~/docker/mailserver/{data,state,logs,config} -p # set owner of working directories sudo chown "$USER":"$USER" ~/docker -R # run the mailserver container docker run -d --name=mailserver --hostname="$HOSTNAME" --domainname="docker.local" -p 25:25 -p 143:143 -p 587:587 -p 993:993 -e ENABLE_SPAMASSASSIN=1 -e SPAMASSASSIN_SPAM_TO_INBOX=1 -e ENABLE_CLAMAV=1 -e ENABLE_POSTGREY=1 -e ENABLE_FAIL2BAN=0 -e ENABLE_SASLAUTHD=0 -e ONE_DIR=1 -e TZ=America/New_York -v ~/docker/mailserver/data/:/var/mail/ -v ~/docker/mailserver/state/:/var/mail-state/ -v ~/docker/mailserver/logs/:/var/log/mail/ -v ~/docker/mailserver/config/:/tmp/docker-mailserver/ --restart=unless-stopped mailserver/docker-mailserver # create a user/inbox docker run --rm -e MAIL_USER=i12bretro@docker.local -e MAIL_PASS=supersecret -it mailserver/docker-mailserver /bin/sh -c 'echo "$MAIL_USER|$(doveadm pw -s SHA512-CRYPT -u $MAIL_USER -p $MAIL_PASS)"' >> ~/docker/mailserver/config/postfix-accounts.cf
Setting Up An E-Mail Client
Download Mozilla Thunderbird Portable Download Run the downloaded paf.exe file and extract it to any location Check the Run box and click Finish Fill out Your name, Email address and Password for the account created earlier Click Manual config For Incoming, enter the DNS name or IP address of the docker host For Outgoing, enter the DNS name or IP address of the docker host Click the Re-test button, Thunderbird should set some additional values Click Done Select I understand the risks > Done From within Thunderbird, compose a new email address and send it to the inbox created earlier to test internal emails are working
Documentation: https://docker-mailserver.github.io/docker-mailserver/edge/