[Exim] Exim -M options

I have checked the manpages for exim using the -M value.

I currently have one backup MX for my main server for when I have
connection problems. There are currently 1000+ messages stored on the
backup that are following the standard retry rules...

Is there anyway I can force the messages to be retried immediately? I
know you can use exim -M 'message-id', but that would take some
serious time for 1000+ messages :)

Thanks in advance.