So we have an SMTP relay running in IIS6.0 on our Intranet host, after discovering it for the first time I realised we have no way to monitor if it's been stopped.

I've tried monitoring a service but the SMTPSVC doesn't stop when that virtual server is stopped. I haven't found anything in event viewer for when I manually stop it and restart it which I could alert on.
I've got the IIS6.0 application set up on the node, alas it doesn't see this SMTP Virtual Server. Is there anyway I can get alerted for when this is stopped?