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This pull request is one of a series of three I created after chasing some dns issues (e.g. here and here but there are more reports of dns issues on github and on the forum)
This pull request can be used separate from the other two (#2191 and #2192). It replaces the bind9 dns resolver with the unbound dns resolver. Reasons: Mail-in-a-Box only uses the recursive part of bind9. Thus replacing with unbound makes for a simpler installation and configuration. It is also a good companion to nsd which is for authorative DNS only.