After following the DKIM https://easyengine.io/tutorials/mail/dkim-postfix-ubuntu/ I cannot start the opendkim service. Log sais:
opendkim: /etc/postfix/dkim.key: open(): Permission denied
If I change the dkim.key file permissions from 600 to 644 the message changes to
opendkim: /etc/postfix/dkim.key: key data is not secure
... which seems logical.
File was written and service started as root.
Anyone an idea about what's going wrong here?