Place 1/2 the mango and 1/2 the juice in a blender and blend until smooth. Pour into a large saucepan. Blend the rest of the mango and juice the same way. Stir in the Low or No-Sugar-Needed Pectin into the mango-juice mixture. Place the saucepan over high heat stirring constantly until the jam comes to a boil that can not be stirred down. Remove from heat and stir the sweetener into the jam mixing well. Return to heat and bring to boil once again stirring constantly for one minute. Remove from heat and pour into clean 1/2 pint jelly jars. Put on canning lids and rings. Process in a boiling water bath for 10 minutes. Remove from canner and cool. Makes 5 1/2 pint jars of jam.