# openssl genrsa -out /etc/mail/dkim/agroena.org.private.key 2048
and # chown _dkimsign:_dkimsign /etc/mail/dkim/agroena.org.private.key # chmod 440 /etc/mail/dkim/agroena.org.private.key
# openssl genrsa -out /etc/mail/dkim/agroena.org.private.key 2048
and # chown _dkimsign:_dkimsign /etc/mail/dkim/agroena.org.private.key # chmod 440 /etc/mail/dkim/agroena.org.private.key