missives
Missive is a term for a written message or letter, especially a formal dispatch or official communication. The word comes from Latin missus “sent,” via Old French missive, and has been used in English since the medieval period to describe communications between individuals, organizations, or states.
In diplomatic and medieval contexts, missives were the formal channels by which rulers, governments, or ambassadors
In Scots law, missives of sale refer to the chain of written negotiations between purchaser and vendor
In modern usage, missive can simply mean any letter or formal communication, including emails. The term remains