To enable DKIM signature, you must have created your mail accounts. Once its done, just run: docker run --rm \ -v "$(pwd)/config":/tmp/docker-mailserver \ -ti tvial/docker-mailserver:latest generate-dkim-config Now the keys are generated, you can configure your DNS server by just pasting the content of `config/opedkim/keys/domain.tld/mail.txt` in your `domain.tld.hosts` zone. ``` ; OpenDKIM mail._domainkey IN TXT ( "v=DKIM1; k=rsa; " "p=AZERTYUIOPQSDFGHJKLMWXCVBN/AZERTYUIOPQSDFGHJKLMWXCVBN/AZERTYUIOPQSDFGHJKLMWXCVBN/AZERTYUIOPQSDFGHJKLMWXCVBN/AZERTYUIOPQSDFGHJKLMWXCVBN/AZERTYUIOPQSDFGHJKLMWXCVBN/AZERTYUIOPQSDFGHJKLMWXCVBN/AZERTYUIOPQSDFGHJKLMWXCVBN" ) ; ----- DKIM key mail for domain.tld ``` ## Verify-only If you want DKIM to only verify incoming emails, the following version of /etc/opendkim.conf may be useful (right now there is no easy mechanism for installing it other than forking the repo): ``` # This is a simple config file verifying messages only #LogWhy yes Syslog yes SyslogSuccess yes Socket inet:12301@localhost PidFile /var/run/opendkim/opendkim.pid ReportAddress postmaster@my-domain.com SendReports yes Mode v ```