Function get_mime_headers

pub async fn get_mime_headers(
    context: &Context,
    msg_id: MsgId,
) -> Result<Vec<u8>>

Get the raw mime-headers of the given message. Raw headers are saved for incoming messages only if set_config(context, "save_mime_headers", "1") was called before.

Returns an empty vector if there are no headers saved for the given message, e.g. because of save_mime_headers is not set or the message is not incoming.