Function said_ham_in 

pub fn said_ham_in(entries: &[Entry], card: &Card) -> bool

Whether the newest entry of entries (oldest first) about the message on card says it is not spam: an entry of its account with its Message-ID, wherever the message was then (the logs of other devices name it by the folder it was in there); for a message without one, an entry without one at its very place (its UIDVALIDITY and UID).