[exim] Redeliver saved message to Envelope-To?

I'm quarantining all spam sent to my system. Occasionally I find a
false positive. I'd like to write a script to automatically deliver
those messages to the original recipient, listed in the Envelope-To
header in the quarantined message. Is there a way to do this from the
command line with exim?

The command

exim4 -bm -ti < quarantined-message

is close to what I want, but it redelivers the message to the To/CC/BCC
recipients, not the Envelope-To recipient.

Thanks,
- Marc