Empty DNS response validating email domain

I have used Apache with mod_md before, but I suddenly have trouble registering a new account. It refuses admin@nat64check.org and claims that the email domain doesn’t have MX or A records. That email address works just fine though. Any thoughts?

My domain is:

I’m using Apache mod_md with this config:
MDomain zaphod.nat64check.org auto

<VirtualHost *:80>
    ServerName zaphod.nat64check.org
    ServerAdmin admin@nat64check.org

<VirtualHost *:443>
    ServerName zaphod.nat64check.org
    ServerAdmin admin@nat64check.org
    Protocols h2 http:/1.1
    SSLEngine on

It produced this output:
[Fri Jun 15 17:29:40.156891 2018] [md:warn] [pid 9311:tid 139743569250048] (20014)Internal error (specific information not available): acme problem urn:acme:error:invalidEmail: Error creating new registration :: empty DNS response validating email domain - no MX/A records

My web server is (include version):

The operating system my web server runs on is (include version):
Ubuntu 16.04

I can login to a root shell on my machine (yes or no, or I don’t know):

I’m using a control panel to manage my site (no, or provide the name and version of the control panel):

Sigh. Never mind, it seems to be a mod_md bug. For some reason it wasn’t using the ServerAdmin from the relevant VirtualHost but from 000-default.conf. That was webmaster@localhost, which explains the error.

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