Community Tip - If community subscription notifications are filling up your inbox you can set up a daily digest and get all your notifications in a single email. X
we have configured Windchill such that we don't have the "Subscribe" function available in our installation, so can we get email notification with any other such feature in WC 9.1?
Not that I am aware of OOTB. You could create your own customization, but I'd assume it's easier to enable Subscriptions.