Can one repent from cursing, and is he who is cursed by Allah and His Messenger deprived of mercy and intercession and abiding eternally in Hell?

Whoever commits a sin that incurs a curse has committed a major sin. The door of repentance is open to him as long as his soul has not reached his throat. If he repents with sincere repentance, Allah will accept his repentance and erase his sin, for the one who repents from sin is like one who has no sin. There are many texts regarding the acceptance of repentance for whoever repents with all its conditions fulfilled and before the death rattle. As for whoever dies persisting in his major sin, his matter is with Allah. However, if he was among the people of monotheism, his ultimate destination is Paradise. As for the polytheist, he will abide eternally in Hellfire.