4 ms·

Proton is not e2e for mails coming from outside Proton, if they aren't GPG encrypted. And in that case they apply very standard spam filters to your mail.

• SahAssar 5y ago
  I assumed that the OP was sending from proton, to proton but looking at the screenshot again I guess that's not clear.
  • zaarn 5y ago
    Protonmail also responded in this thread with a message stating that this is in fact their spam filter.