In that it claims to be &#x27;end to end&#x27; encryption, but that both &#x27;ends&#x27; are from the same vendor, it&#x27;s exactly the same.<p>So if you use protonmail and your colleague uses this, and you want to have a secure conversation over email, you&#x27;re each going to be clicking clicking a fuck load of &quot;view this message on &lt;service you don&#x27;t use&gt;&quot; links.