Add Alert for non-authenticated user?

I have an anonymously accessible single-server Foundation farm built on an external server that uses a handful of local, non-AD server accounts for admin.

I have a list, and I need a way to set up something like an email Alert on my internal, AD farms.

In my Local Users and Groups, I'm not seeing a way to add email information. I tried adding aname@domain.com directly into the Send Alerts To field, but it did not recognize it.

I'm trying to figure out the right approach, or if it's even doable.

Ideas?

Thanks,

Scott