"The sacrament of confession requires the physical presence of the priest and the penitent. Privacy is absolutely not guaranteed on Internet, and there is no certainty as to the identity of the two parties to the communication. You can’t have confession by e-mail, any more than you can have it by telephone or letter."
The sacrament of confession must always take place in “the sacramental context of a personal encounter.”
“Internet offers the Church the opportunity to make the saving message of Christ accessible throughout the world. In societies that don’t allow the presence of priests, nuns, religious or lay missionaries, Internet can offer people undertaking a spiritual quest, or even just the curious, a chance to obtain information or find an inspiration that would otherwise be impossible.”
Archbishop John Foley, the president of the Pontifical Council for Social Communications.