From Mobile

New York, March 28. The IleraM1! Dauphin Islnnd, Ala., correspondent, of the 15th, says: Authorities refnso to exchange ne-vspapers. One of our monitors made au important reconnoisstince of the rebel worku on the 16th, and was allowed to move abont without being fired upon. Tho authorities of the city appear to be determined to make a resiatnnoo. Ilumors 8re rife in New Orleans that tho rebel troops wero preparing to evacúate Mobile and join Lee's army somewhcre in East Tennessee.