dns verified
DNS overrides
Pins a hostname to an address, bypassing resolution for that name.
In detail
Two columns with more consequence than they look. Legitimate uses are testing against a specific server and working around a receiver whose DNS is broken; the hazard is that an override outlives its reason and silently keeps sending mail to an address that has moved. Anything Hub writes here should carry an expiry in Hub's own records, because the table has no column for one.