This happened after I updated to the master branch from the 0.40 tag. In the System Status Checks page, I see that all domains now have autoconfig.example.com and autodiscover.example.com added.
The error message is the same to all:
This domain should resolve to your box's IP address (AAAA 2a03:b0c0:0:1010::8f2:b001) if you would
like the box to serve webmail or a website on this domain. The domain currently resolves to [Not Set] in
public DNS. It may take several hours for public DNS to update after a change. This problem may result
from other issues listed here.
Is this known?