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 This is basically subscribing to an email newsletter but with an anonymous email address right?

I suppose SMTP will dox your IP, so you rely on an email provider which is the same as relying on relays in nostr 
 Pretty much, but a far simpler and more secure protocol. 
 It's different for two reasons.
One is identity/authentication.
The other is redundancy -- you can work with as many relays as you wish simultaneously.

So, it's uncensorable.