The Daggers could have no complaints at all after crashing to their heaviest defeat of the season.
The truth is it could even have been worse after what must rate as their poorest performance of the campaign.
Portsmouth dominated from first whistle to last and in addition to their four goals they hit the woodwork twice and had another effort cleared off the line.
The game meant much more to Pompey, fighting for their lives after being too close to the relegation zone for comfort.
The Daggers, by comparison, had gone into April not facing the drop for the first time in four years.
With nothing to play for there was no pressure on them and they could afford to relax, although safe or not the paying customers were entitled to expect more from them.
Portsmouth carved their first opening after just ten seconds, hit the woodwork after two minutes and took the lead after three. That set a pattern that never changed.
Only for a brief spell towards the end of the first half did Wayne Burnett’s team threaten to make a match of it. For the most part it was Portsmouth all the way.
It was clear from the off the game meant more to Pompey, who were quicker, sharper, hungrier. And they had threatened twice before making the breakthrough in that third minute.
Danny Hollands gave them a flying start by netting from close range after a deep corner from the right was headed back.
They went two up in the 21st minute, when a weak back header from Luke Wilkinson
left keeper Chris Lewington
struggling and gave Michael Drennan a simple scoring chance.
The Daggers pulled one back in the 34th minute, skipper Abu Ogogo
following up to head in after Pompey keeper Trevor Carson produced a brilliant save from Medy Elito
That turned out to be the only time in the game Carson was seriously tested and Portsmouth – roared on by 1,500 fans, kept the Daggers on the back foot in the second half.
In the 56th minute Daggers managed to lose the ball deep in Portsmouth’s half and paid the price when they broke away and set up Drennan to drill in a great low shot from 25 yards.
The home team’s agony was complete when another mix up allowed Jed Wallace to fire Portsmouth’s fourth four minutes from time and the Daggers left the field to chants of “can we play you every week” from travelling fans.
Dagenham & Redbridge:
Lewington, Hoyte, Saah, Wilkinson, Connors, Elito, Howell (Obafemi 80), Ogogo, Shields (Azeez 62), Norris (D’Ath 19), Dickson.
Seabright, Bingham, Saunders, Gayle.
3,150 (1,374 away)