Josip Rodin wrote:
There's nothing more anti-social in sender verification than in any other similar check - if someone sends mail from an address that cannot be delivered to, I don't want to accept it, because I can't deliver a reply to them. If they want to talk to me, but won't accept replies from me, who exactly is antisocial there?
I've seen a lot of announcement/verification emails (such as Amazon orders) which go out from an address that does not exist - presumably such emails would be blocked by sender verification? You could argue perhaps that the people sending out these emails shouldn't be doing this, or that developers shouldn't be using @debian.org addresses for that purpose, but it's not quite as clear cut as not being able to reply means that you don't want to receive an email.
Paul