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docker-mailserver with ssl

There are multiple options to enable SSL:

using letsencrypt
using self-signed certificates with the provided tool

let's encrypt

To enable Let's Encrypt on your mail server, you have to add en environment variable DMS_SSL with value letsencrypt (see docker-compose.yml.dist) You also have to mount your letsencrypt folder to /etc/letsencrypt and it should look like that:

├── etc
│   └── letsencrypt
│       ├── accounts
│       ├── archive
│       │   └── mail.domain.com
│       │       ├── cert1.pem
│       │       ├── chain1.pem
│       │       ├── fullchain1.pem
│       │       └── privkey1.pem
│       ├── csr
│       ├── keys
│       ├── live
│       │   └── mail.domain.com
│       │       ├── cert.pem -> ../../archive/mail.domain.com/cert1.pem
│       │       ├── chain.pem -> ../../archive/mail.domain.com/chain1.pem
│       │       ├── combined.pem
│       │       ├── fullchain.pem -> ../../archive/mail.domain.com/fullchain1.pem
│       │       └── privkey.pem -> ../../archive/mail.domain.com/privkey1.pem
│       └── renewal

You don't have anything else to do.

self signed certificates

You can easily generate a self-signed SSL certificate by using the following command:

docker run -ti --rm -v "$(pwd)"/postfix/ssl:/ssl -h mail.my-domain.com -t tvial/docker-mailserver generate-ssl-certificate

Press enter

Enter a password when needed

Fill information like Country, Organisation name

Fill "my-domain.com" as FQDN for CA, and "mail.my-domain.com" for the certificate.

They HAVE to be different, otherwise you'll get a `TXT_DB error number 2`

Don't fill extras

Enter same password when needed

Sign the certificate? [y/n]:y

1 out of 1 certificate requests certified, commit? [y/n]y

will generate:

postfix/ssl/mail.my-domain.com-key.pem (used in postfix)

postfix/ssl/mail.my-domain.com-req.pem (only used to generate other files)

postfix/ssl/mail.my-domain.com-cert.pem (used in postfix)

postfix/ssl/mail.my-domain.com-combined.pem (used in courier)

postfix/ssl/demoCA/cacert.pem (certificate authority)

Note that the certificate will be generate for the container fqdn, that is passed as -h argument. Check the following page for more information regarding postfix and SSL/TLS configuration.

If a matching certificate (files listed above) is found in postfix/ssl, it will be automatically setup in postfix and courier-imap-ssl. You just have to place them in postfix/ssl folder.

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