Package request: opendkim
To sign outgoing and to verify incoming email messages with Postfix, it would be possible to use opendkim as millter (instead of perl-mail-dkim). Opendkim supports any milter-aware MTA and is actively maintained/supported.
Link: http://www.opendkim.org
(from redmine: issue id 2448, created on 2013-12-01, closed on 2019-05-02)