In case this takes longer to resolve and you're affected by this: Here is how you can build the patched packages yourself.
https://www.webfactory.de/blog/patch-qmail-in-ubuntu-to-avoid-cname-lookup-failed-temporarily-errors
In case this takes longer to resolve and you're affected by this: Here is how you can build the patched packages yourself.
https:/ /www.webfactory .de/blog/ patch-qmail- in-ubuntu- to-avoid- cname-lookup- failed- temporarily- errors