fix dagent startup

core/Dockerfile

@@ -16,10 +16,12 @@ apt-get autoclean
 rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* ~/.cache ~/.npm
 rm -rf core-11.0.2.50.507cbae-Ubuntu_20.04-amd64
 EOF
+# TODO: system ssl PKI for dagent and spooler ssl connection
 # use envsubst in entrypoint script to convert config templates to actual config files
 COPY --chmod=0775 entrypoint.sh /entrypoint.sh
 # https://documentation.kopano.io/kopanocore_administrator_manual/configure_kc_components.html#configure-kopano-dagent-for-delivery-via-unix-socket
-EXPOSE 236     # mapi (server)
+EXPOSE 236     # mapi (client-server)
+EXPOSE 237     # tls_mapi (server-server)
 EXPOSE 2003    # lmtp (dagent)
 VOLUME /etc/kopano
 VOLUME /var/lib/kopano/attachments