Is it possible for God to communicate with a servant via computer, sending him written messages stating that he is among the people of Hellfire, and that his mother is among the people of Paradise, and his brother is among the people of Hellfire? And if this is not possible, what is the evidence for that?

These messages may be from internet professionals, and reason does not suggest that they are from God, but religious law has not confirmed this. Allah has reserved knowledge of the unseen for Himself and has not disclosed it to anyone except some of His messengers, through what He revealed to them, as He says: (And Allah would not acquaint you with the unseen, but Allah chooses from His messengers whom He wills), and His saying: (Knower of the unseen, and He does not disclose His unseen to anyone Except to whom He has approved of messengers). And "not everything possible comes into existence"; for Allah's power encompasses everything, but there is no necessary correlation between it and the occurrence of every possibility, such as prohibiting permissible things or permitting forbidden things. Therefore, one must strive in obedience to Allah and ask Him for Paradise, and not be preoccupied with such matters.