I was surprised to learn last month that "you can impersonate other Fastmail customers by just spoofing the email address". https://news.ycombinator.com/item?i

I was surprised to learn last month that "you can impersonate other Fastmail customers by just spoofing the email address". https://news.ycombinator.com/item?id=18996200#18997054 https://news.ycombinator.com/item?id=18996200#18997054