Is it possible to access email addresses and notification settings for subscribers?

[BarryCarlyon]

@Doug_Hughes

Is it possible to get a list of channel subscribers

If you have the broadcasters permission:

Reference

@Doug_Hughes

with email addresses

If you have permission from the user

Reference

@Doug_Hughes

and their notification settings?

That is not exposed in Helix no.

@Doug_Hughes

More specifically, is it possible to get a user’s email and notification settings who isn’t the user authorized via OAuth?

No, you need permission from the user, to read the users email address.