The problem happens for users who encrypt the email using the settings under the email File dialog (File > Encrypt), ...

Microsoft has confirmed a known issue that prevents recipients from opening encrypted emails in classic Outlook.

In the latest version of classic Outlook, users can't open encrypted emails. Microsoft confirms the issue and is investigating.

I have been moving from Google and Microsoft to Proton products. Proton's email and other products include encryption by default, and password-protecting messages adds a layer of security. However, I ...

(The Hill) — Google announced Tuesday that Gmail users will soon be able to send and receive encrypted emails without a third-party provider. The new process will allow Gmail users to send end-to-end ...