Forwarding services

It’s just a lot better targeted, on one side towards naïve users that leave their contact information on shady websites, on the other side towards companies that run not-real-smtp exchange (it’s a lot easier to spam people that use a product that hides by default the smtp headers that would allow filtering spam, because the company PR teams are spamming internal users in the first place and are afraid those users would use filtering to /dev/null their newsletters).