Random idea:
User can select the smtp service version that it wants to relay its emails with.
This would mean that when user registers, he can verify the code of the different smtp service versions, and select one that fits his needs.
This would basically mean, that he is fully in control which smtp service relays his emails, and it can't be change without his approval.
So it is like installing a software on your computer, and being able to update, or iust opt out.
So no change would be enforcable on the user.
#grownostr #plebchain #nostr #email #privacy