Am 2019-02-27 22:30, schrieb info at smallinnovations dot nl:
> Apparently opendkim 2.11 has been polluted/infected by systemd. Lots of
> systemd bugreports, notes about being a native systemd daemon but
> simply
> not working from postfix. I downgraded opendkim from 2.11 to 2.9 and
> everythings is working again.

I'm using rspamd and also use it for dkim signing. Works very well.
https://rspamd.com/doc/modules/dkim_signing.html

Jochen