Help needed - node_expire is e-mailing every hour to tell me that every node on my website is about to expire!! ;o)

Hello everyone,

I've been a bit thick with node expire, and obviously haven't set it up properly.

I've installed it and created a rule to send an e-mail to the owner of the node when an item of content is about to expire.

Unfortunately, I seem to have made a mistake (or several!) as I'm being e-mailed on every cron run, with one e-mail per node on my site (regardless of whether it has an expiry date or not).

The rule says simply:
- if node is expired
- send an e-mail to the node author

So, I need to know:
- how do I set node_expire up so that it e-mails me once and once only when a node is about to expire
- how do I make sure I only receive an e-mail for nodes which actually have an expiry date set?
- do I need to set a flag once the e-mail has been sent, and if so, how do I then un-set it once the node has been updated?

Any help anyone could offer would be really gratefully received - thank you!!

Al