What is the ruling on conveying greetings of peace between disputing parties? And is conveying greetings of peace considered a trust?

Conveying greetings is obligatory according to the Shafi'is, and according to some scholars, if the messenger committed to it, because it has become a trust upon him. Jibreel (peace be upon him) conveyed Allah's greetings to Aisha (may Allah be pleased with her). So, whoever is sent with greetings to a person, let him convey them, even if there was a previous dispute between them, with the reminder that a Muslim is not permitted to abandon his Muslim brother for more than three nights.