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Trivial opendkim container

Installation

  • Edit the data/conf/opendkim.conf file to specify your domain name instead of shpakovsky.ru

  • (optionally) edit other settings in that file as you like, use opendkim.conf man page for more info

  • (optionally) edit the data/conf/bodylength.txt to specify emails of mailing lists (where you send mails to), which might append text at the end of your messages (read more about bodylength to understand this).

  • (optionally) edit the data/conf/dontsignto.txt file to specify emails mail to which should not be signed at all.

  • Generate new key (specify your domain instead of shpakovsky.ru):

      # enter the container
  docker run --rm -it dkim sh

  # generate the key
  cd /data/key
  opendkim-genkey -s postfix -d shpakovsky.ru

  • Add DKIM DNS record - its content is in data/key/postfix.txt file

  • (optionally) also add DMARC and SPF records.

  • (optionally) test that your email is properly DKIM-signed.

In case of problems, check this awesome DKIM guide from Digital Ocean.

Usage

To use this milter in your postfix, add this line to your main.cf file:

smtpd_milters = inet:dkim:12301

where dkim is IP address or hostname of VM or container where this milter is running, and 12301 is port number from data/conf/opendkim.conf file.