With a multi-year site, is there a way I can quickly check to see which classmates have opted out of receiving emails?

Pretend you are doing a site wide email to all Classmates. You don't actually have to send anything, just follow these steps:

Try doing a site wide mass email, but use the option to pick and choose Classmates rather than send to all Classmates.

1) Click "Email the Class"

2) Click "Send to Classmates from the following years only: (click to show)"

3) Below the years click the "Check all"

4) Press the Compose Eamil button

5) Below your email window you will see all Classmates. Those with "Notify Flag Off" have opted out.

thanx.