qconfirm-inject/qconfirm-notice

I've been playing with the new version of qconfirm. I used qconfirm-conf -i to
set up the qconfirm-inject/qconfirm-notice stuff, and I've configure mutt to
send mail using qconfirm-inject.

I sent mail to a couple of addresses that I know to be qconfirm protected, and,
as I had a vague idea should happen, the confirmation process was handled
automatically, and a "confirmation accepted" message was eventually delivered
to me. But with one particular qconfirm protected address, the "please confirm
your message" message is delivered to my mailbox, instead of being handled
automatically by qconfirm-notice. Does anyone know what would cause
qconfirm-notice not to recognize a confirmation request? His setup is pretty
generic (I set it up myself). He changed the text of his confirmation messages,
but that's the only thing non-standard about it.

Is this the sole purpose of qconfirm-inject/qconfirm-notice, i.e the automatic
return of confirmation requests? Is there something else it does? Will it
confirm qsecretary messages? I've read the documentation eleventy zillion
times, but it's all still a bit hazy to me.

Chris