“… Email privacy is dead, confirmed for the umpteenth time. In this post I present the SOILED-PRIVACY attacks (Systemic Online Information Leakage using Email+DMARC against Privacy). These are two reflected attacks against email infrastructure allowing an attacker to access private knowledge about a target user, transparent to mail forwarding, mailing lists, and web services …”: https://bearbin.net/blog/2020/dmarc-attacks