Function receive_imf_inner

pub(crate) async fn receive_imf_inner(
    context: &Context,
    rfc724_mid: &str,
    imf_raw: &[u8],
    seen: bool,
    partial: Option<(u32, Option<String>)>,
) -> Result<Option<ReceivedMsg>>

Receive a message and add it to the database.

Returns an error on database failure or if the message is broken, e.g. has nonstandard MIME structure.

If possible, creates a database entry to prevent the message from being downloaded again, sets chat_id=DC_CHAT_ID_TRASH and returns Ok(Some(…)). If the message is so wrong that we didn’t even create a database entry, returns Ok(None).

If partial is set, it contains the full message size in bytes and an optional error text for the partially downloaded message.