Honestly if you were able to live without a phone until now, living without Gmail (or what you call a mainstream email) is pretty easy. There are still plenty

Honestly if you were able to live without a phone until now, living without Gmail (or what you call a mainstream email) is pretty easy. There are still plenty of email providers left and right that will allows you to subscribe without a phone number. You’ll probably have to pay though. What may be harder in this precise use case is getting a domain name (which is not mandatory but really helpful if you want to be able to switch providers easily) but I’m pretty sure you can still register domains with a landline number.