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Import the url with relevant items only
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Johan Smits
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It can be useful for new users to see how other projects have built a mailserver from the container `docker-mailserver`.
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Here is a list of such installation pages:
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- https://github.com/docker-scripts/moodle/blob/master/docs/email-setup.md#building-a-simple-mailserver
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-
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## Building a simple mailserver
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(Add other pages that you know)
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We are going to use this docker based mailserver:
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- First create a directory for the mailserver and get the setup script:
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```
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mkdir -p /var/ds/mail.example.org
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cd /var/ds/mail.example.org/
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curl -o setup.sh \
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https://raw.githubusercontent.com/tomav/docker-mailserver/master/setup.sh
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chmod a+x ./setup.sh
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```
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- Create the file `docker-compose.yml` with a content like this:
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```
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version: '2'
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services:
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mail:
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image: tvial/docker-mailserver:latest
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hostname: mail
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domainname: example.org
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container_name: mail
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ports:
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- "25:25"
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- "587:587"
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- "465:465"
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volumes:
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- ./data/:/var/mail/
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- ./state/:/var/mail-state/
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- ./config/:/tmp/docker-mailserver/
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- /var/ds/wsproxy/letsencrypt/:/etc/letsencrypt/
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environment:
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- PERMIT_DOCKER=network
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- SSL_TYPE=letsencrypt
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- ONE_DIR=1
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- DMS_DEBUG=1
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- SPOOF_PROTECTION=0
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- REPORT_RECIPIENT=1
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- ENABLE_SPAMASSASSIN=0
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- ENABLE_CLAMAV=0
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- ENABLE_FAIL2BAN=1
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- ENABLE_POSTGREY=0
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cap_add:
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- NET_ADMIN
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- SYS_PTRACE
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```
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For more details about the environment variables that can be used,
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and their meaning and possible values, check also these:
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- https://github.com/tomav/docker-mailserver#environment-variables
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- https://github.com/tomav/docker-mailserver/blob/master/.env.dist
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Make sure to set the propper `domainname` that you will use for the
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emails. We forward only SMTP ports (not POP3 and IMAP) because we
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are not interested in accessing the mailserver directly (from a
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client). We also use these settings:
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- `PERMIT_DOCKER=network` because we want to send emails from other
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docker containers.
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- `SSL_TYPE=letsencrypt` because we will manage SSL certificates
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with letsencrypt.
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- We need to open these ports on the firewall: `25`, `587`, `465`
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```
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ufw allow 25
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ufw allow 587
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ufw allow 465
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```
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On your server you may have to do it differently.
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- Pull the docker image:
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```
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docker pull tvial/docker-mailserver:latest
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```
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- Now generate the DKIM keys with `./setup.sh config dkim` and copy
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the content of the file `config/opendkim/keys/domain.tld/mail.txt`
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on the domain zone configuration at the DNS server. I use
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[bind9](https://github.com/docker-scripts/bind9) for managing my
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domains, so I just paste it on `example.org.db`:
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```
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mail._domainkey IN TXT ( "v=DKIM1; h=sha256; k=rsa; "
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"p=MIIBIjANBgkqhkiG9w0BAQEFACAQ8AMIIBCgKCAQEAaH5KuPYPSF3Ppkt466BDMAFGOA4mgqn4oPjZ5BbFlYA9l5jU3bgzRj3l6/Q1n5a9lQs5fNZ7A/HtY0aMvs3nGE4oi+LTejt1jblMhV/OfJyRCunQBIGp0s8G9kIUBzyKJpDayk2+KJSJt/lxL9Iiy0DE5hIv62ZPP6AaTdHBAsJosLFeAzuLFHQ6USyQRojefqFQtgYqWQ2JiZQ3"
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"iqq3bD/BVlwKRp5gH6TEYEmx8EBJUuDxrJhkWRUk2VDl1fqhVBy8A9O7Ah+85nMrlOHIFsTaYo9o6+cDJ6t1i6G1gu+bZD0d3/3bqGLPBQV9LyEL1Rona5V7TJBGg099NQkTz1IwIDAQAB" ) ; ----- DKIM key mail for example.org
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```
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- Add these configurations as well on the same file on the DNS server:
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```
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mail IN A 10.11.12.13
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; mailservers for example.org
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3600 IN MX 1 mail.example.org.
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; Add SPF record
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IN TXT "v=spf1 mx ~all"
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```
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Then don't forget to change the serial number and to restart the service.
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- Get an SSL certificate from letsencrypt. I use
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[wsproxy](https://github.com/docker-scripts/wsproxy) for managing
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SSL letsencrypt certificates of my domains:
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```
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cd /var/ds/wsproxy
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ds domains-add mail mail.example.org
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ds get-ssl-cert myemail@gmail.com mail.example.org --test
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ds get-ssl-cert myemail@gmail.com mail.example.org
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```
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Now the certificates will be available on
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`/var/ds/wsproxy/letsencrypt/live/mail.example.org`.
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- Start the mailserver and check for any errors:
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```
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apt install docker-compose
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docker-compose up mail
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```
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- Create email accounts and aliases:
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```
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./setup.sh email add admin@example.org passwd123
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./setup.sh email add info@example.org passwd123
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./setup.sh alias add admin@example.org myemail@gmail.com
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./setup.sh alias add info@example.org myemail@gmail.com
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./setup.sh email list
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./setup.sh alias list
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```
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Aliases make sure that any email that comes to these accounts is
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forwarded to my real email address, so that I don't need to use
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POP3/IMAP in order to get these messages. Also no anti-spam and
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anti-virus software is needed, making the mailserver lighter.
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- Send some test emails to these addreses and make other tests. Then
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stop the container with `Ctrl+c` and start it again as a daemon:
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`docker-compose up mail -d`.
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- Now save on Moodle configuration the SMTP settings and test by
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trying to send some messages to other users:
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- **SMTP hosts**: `mail.example.org:465`
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- **SMTP security**: `SSL`
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- **SMTP username**: `info@example.org`
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- **SMTP password**: `passwd123`
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