4 ms·Having SPF/DKIM in DNS records doesn't prevent that.by megous 3y agoHaving SPF/DKIM in DNS records doesn't prevent that.LeonM 3y agoThis is exactly what SPF and DKIM are designed to do. DMARC enforces this. Obviously, this is opportunistic security, the receiver must support all this, but >99% does.megous 3y agoYes, but the public testers are not testing the receive side, but the sending side.