They surpassed the previous record of 263-5, set by Royal Challengers Bangalore in 2013
Mourinho, who had been sent to the stands against Burnley last month for abuse towards referee Mark Clattenburg, this time received his matching orders from Jon Moss in the 27th minute after petulantly kicking a drinks bottle down the touchline.
United largely dominated the match but were thwarted by fine goalkeeping from Darren Randolph and had to settle for a fourth consecutive home draw which left them in sixth place, 11 points off the top of the table.