local_mailserver_without_dnscontrol parameter in the directadmin.conf to be set to 1 by default. We will release a fix for this, a temporary workaround is to manually set local_mailserver_without_dnscontrol=1 in the directadmin.conf.That indeed fixed it. Thank you very much.manually setlocal_mailserver_without_dnscontrol=1in thedirectadmin.conf.
f42272a9ea817a0fc6f470e3d8746802cedcd36a have this issue with default config value fixed. With the latest build there is not need to manually set local_mailserver_without_dnscontrol=1 for MX control page to appear.