As I understand it some non-Catholic Christians may approach a Catholic priest to have their confession heard validly if they spontaneous ask for it. This being the case may a Catholic approach another denominations (i.e. Orthodox) to receive the sacrament of reconciliation (confession) validly? Since some denominations are permitted to receive holy Communion in the Catholic Church, based on Catholic doctrine may we fulfill are obligation of Mass attendance by going to a church that believes in the presence of Christ in the Eucharist (i.e. Orthodox) and may we validly receive the sacrament of reconciliation (confession) in these same churches?