[grumpyinfosec]

This makes alot of business sense, most orgs know better than to homebrew their mail env on (lets be honest here) "basement hosting LLC". So that leaves the people that are spamming/phishing as the core SMTP customer here.

We lost the personal self hosting fight long ago. I used to do it, but now i pay protonmail to do it for me and even that is losing its luster since proton technology IP blocks are pretty radioactive at this point. Some day will have join the outlook or gmail gang which makes me sad; but setting here in my chair staring at my orgs email firewalls and seeing 80+% inbound volume being auto-blocked as spam, bulk or phishing it make me wonder if anything of value was lost.