Install UFW

(sudo apt install ufw) and enable the following ports


Service	Protocol	Port	Container	Variable
Postfix SMTP	TCP	25	postfix-mailcow	${SMTP_PORT}
Postfix SMTPS	TCP	465	postfix-mailcow	${SMTP_PORT}
Postfix Submission	TCP	587	postfix-mailcow	${SUBMISSION_PORT}
Dovecot IMAP	TCP	143	dovecot-mailcow	${IMAP_PORT}
Dovecot IMAPS	TCP	993	dovecot-mailcow	${IMAPS_PORT}
Dovecot POP3	TCP	110	dovecot-mailcow	${POP_PORT}
Dovecot POP33S	TCP	995	dovecot-mailcow	${POPS_PORT}
Dovecot ManageSieve	TCP	4190	dovecot-mailcow	${SIEVE_PORT}
HTTP(S)	TCP	80/443	nginx-mailcow	${HTTP_PORT} `/` ${HTTPS_PORT}

The minimal DNS configuration

https://docs.mailcow.email/getstarted/prerequisite-dns/#the-minimal-dns-configuration

This example shows you a set of records for one domain managed by mailcow. Each domain that is added to mailcow needs at least this set of records to function correctly.

# Name Type Value mail IN A 1.2.3.4 autodiscover IN CNAME mail.example.org. (your ${MAILCOW_HOSTNAME}) autoconfig IN CNAME mail.example.org. (your ${MAILCOW_HOSTNAME}) @ IN MX 10 mail.example.org. (your ${MAILCOW_HOSTNAME})

Note: The mail DNS record which binds the subdomain to the given ip address must only be set for the domain on which mailcow is running and that is used to access the web interface. For every other mailcow managed domain, the MX record will route the traffic.

DKIM, SPF and DMARC

https://docs.mailcow.email/getstarted/prerequisite-dns/#dkim-spf-and-dmarc

In the example DNS zone file snippet below, a simple SPF TXT record is used to only allow THIS server (the MX) to send mail for your domain. Every other server is disallowed but able to ("~all"). Please refer to SPF Project for further reading.

# Name Type Value @ IN TXT "v=spf1 mx a -all"

It is highly recommended to create a DKIM TXT record in your mailcow UI and set the corresponding TXT record in your DNS records. Please refer to OpenDKIM for further reading.

# Name Type Value dkim._domainkey IN TXT "v=DKIM1; k=rsa; t=s; s=email; p=..."

The last step in protecting yourself and others is the implementation of a DMARC TXT record, for example by using the DMARC Assistant (check).

# Name Type Value _dmarc IN TXT "v=DMARC1; p=reject; rua=mailto:mailauth-reports@example.org"

Testing

https://docs.mailcow.email/getstarted/prerequisite-dns/#testing

Here are some tools you can use to verify your DNS configuration:

MX Toolbox https://mxtoolbox.com/SuperTool.aspx (DNS, SMTP, RBL)
port25.com https://www.port25.com/dkim-wizard/ (DKIM, SPF)
Mail-tester https://www.mail-tester.com/ (DKIM, DMARC, SPF)
DMARC Analyzer https://www.dmarcanalyzer.com/spf/checker/ (DMARC, SPF)
MultiRBL.valli.org http://multirbl.valli.org/ (DNSBL, RBL, FCrDNS)

Insure that docker and docker-compose is install and running

Install mailcow
https://docs.mailcow.email/getstarted/install/#install-mailcow

Clone the master branch of the repository, make sure your umask equals 0022. Please clone the repository as root user and also control the stack as root. We will modify attributes - if necessary - while bootstrapping the containers automatically and make sure everything is secured. The update.sh script must therefore also be run as root. It might be necessary to change ownership and other attributes of files you will otherwise not have access to. We drop permissions for every exposed application and will not run an exposed service as root! Controlling the Docker daemon as non-root user does not give you additional security. The unprivileged user will spawn the containers as root likewise. The behaviour of the stack is identical.

$ su # umask 0022 # \<- Verify it is 0022 cd /opt git clone [https://github.com/mailcow/mailcow-dockerized](https://github.com/mailcow/mailcow-dockerized) cd mailcow-dockerized

Initialize mailcow

https://docs.mailcow.email/getstarted/install/#initialize-mailcow

Generate a configuration file. Use a FQDN (host.domain.tld) as hostname when asked.

./generate_config.sh

Start mailcow

https://docs.mailcow.email/getstarted/install/#start-mailcow

Pull the images and run the compose file. The parameter -d will start mailcow: dockerized detached:

docker compose (Plugin)docker-compose (Standalone)

docker compose pull docker compose up -d

Administrators:
You can now log in as an administrator using the default credentials admin and the password moohoo at:
https://${MAILCOW_HOSTNAME}/admin - Regular mailbox users:
Continue logging in at the usual URL:
https://${MAILCOW_HOSTNAME} (FQDN only) - Domain administrators:
Log in at the dedicated URL:
**`https://${MAILCOW_HOSTNAME}/domainadmin

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