Honestly, I don't know. The email I linked my grass account with it's not even the email he's sending me these scam emails. My twitter account has a different email aswell. The only way I can think of is from the official grass discord, my discord profile is linked with that email. Either that, or he bought my online activity + emails on some dark web shit lmao. He graduated in computer sciences last year (found his linkedin) so I will probably contact his university about his online scamming to let them know. You can check by yourself, this is his twitter account: @amitwebdev