Barry Corr's fifth goal of the season was enough to earn Southend a 1-0 win over managerless Lincoln.
Chris Sutton quit at Sincil Bank on Wednesday and first team coach Scott Lindsey took command for the trip to Roots Hall.
But Blues made the perfect start when the unmarked Corr headed a deep left-wing cross from Ryan Hall into the net in the third minute from six yards out.
Josh O'Keefe shot over for City but Southend gradually upped the pressure with shots off target before Corr forced a save out of Joe Anyon with a header as the half closed.
The Imps upped their tempo in the second half and saw striker Ben Hutchinson head against the left post from Albert Jarrett's corner, before the winger's free kick was tipped over by Glenn Morris and Hutchinson headed wide when well placed.
Both sides created opportunities but were unable to get them on target until a late Lincoln corner from Jarrett saw Moses Swaibu's header cleared off the line.
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