Try log redirection another way

opendkim/Dockerfile

@@ -18,17 +18,5 @@ RUN chmod 755 /boot
 
 ENV OPEN_DKIM=true
 
-# Redirect logs for Docker to pickup
-RUN ln -sf /dev/stdout /var/log/mail.log && \
-  ln -sf /dev/stdout /var/log/mail.info && \
-  ln -sf /dev/stdout /var/log/mail.warn && \
-  ln -sf /dev/stderr /var/log/mail.err
-# Make logs writable for everyone
-RUN chmod 002 /var/log/mail.log \
-  /var/log/mail.info \
-  /var/log/mail.warn \
-  /var/log/mail.err
-
 EXPOSE 8891
-
 ENTRYPOINT /boot; opendkim -f -p inet:8891@0.0.0.0