Function message_from 

pub fn message_from(
    raw: &[u8],
    path: &Path,
    triaged: &Triaged,
    own: &[String],
    tr: &Translator,
    pgp: Option<PgpView>,
) -> Option<MessageView>

The same from the message’s bytes (decrypted, they live only in memory), with what OpenPGP found when it was protected.