Thank you for your possible offer to help.
When I said cron, I meant a scheduled task, tho I could run a cron job with my server...
What I'm attempting to do is have a custom profile field that a user can either check or add an email address to in order to add them to the list of people who recieve email notifications of every post in a specific category or forum.
Poeple have requested a mod something like this before, which is why I didn't post specifics initially.
So what I would like the scheduled task to to (or if it can be done as an sql query when submitting a change to that user profile) is to check to see which users have selected this option and then add their email address to the list.
The reason I'd like to do this is that I'm attempting to port a group of people that are used to Yahoo Groups and like having every post sent to their email accounts.
If there's a better way of doing this I'd like to know...
Thank you again.