[Bug 1787739] Re: postfix name lookup failed after dist-upgrade (Aug-2018)

[Andreas Hasenack]

Note that in this last set of examples you were using the systemd
resolver (127.0.0.53). Which might be setup (or not) to query the bind
server you are testing.

I suggest to always start from a clean slate in that case. You can clear
the systemd resolver cache by running:

sudo systemd-resolve --flush-caches

Another interesting check, if you keep using that resolver, is systemd-
resolve --status

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Title:
  postfix name lookup failed after dist-upgrade (Aug-2018)

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