The mail is encrypted, so probably not, but they have an extensive privacy policy and some blog entries, against which threats they can protect you, which they can’t
Comment on let's kill proton mail
UnRelatedBurner@sh.itjust.works 4 days ago
quick question, if I registered for free with no identifier, and I get an email that has my info, like I order something, is that account “compromised”? Can they now link all other emails to me?
tuhriel@discuss.tchncs.de 3 days ago
dev_null@lemmy.ml 2 hours ago
Not on Proton’s side, but whoever sent you that email obviously has both your info and your Proton address so they know it’s connected to you, even if Proton doesn’t.