Darlington ended Dagenham's unbeaten home record with a comprehensive win.
The Quakers took the lead on the stroke of half-time when captain Stephen Foster volleyed Clark Keltie's free-kick into the roof of the net.
They scored again midway through the second half when Julian Joachim left Scott Griffiths for dead and his cross was slammed home by Gregg Blundell.
Tommy Wright completed the rout after a one-two with Michael Cummins, Dagenham forcing just one save from Andy Oakes.
Dag & Red: Roberts, Foster , Uddin, Smith, Griffiths, Saunders, Rainford (Sloma 74), Huke, Southam, Moore (Green 77), Strevens.
Subs Not Used: Thompson, Taylor, Boardman.
Darlington: Oakes, Purdie, White, Foster, Ryan, Joachim, Keltie (Ravenhill 89), Cummins, Wainwright, Blundell, Wright.
Subs Not Used: Brooks-Meade, Miller, Wiseman, Barrua.
Booked: Keltie, Ravenhill.
Goals: Foster 45, Blundell 67, Wright 83.
Ref: Paul Melin (Surrey).