So I've read more about ello.co. They protect privacy (so they say), don't sell user data and allow fakes. My call.
However, there's a pitfall:
Received: from o167893375.outbound-mail.sendgrid.net (o167893375.outbound-mail.sendgrid.net [184.108.40.206]) (using TLSv1 with cipher DHE-RSA-AES128-SHA (128/128 bits)) (No client certificate requested) by mx.daemon.de (Postfix) with ESMTPS id C395612397F for ; Fri, 26 Jun 2015 14:58:57 +0200 (CEST) .. From: Ello <firstname.lastname@example.org>
As you can see, the registration email came from sendgrid.me. Not from Ello. Now sendgrid.me knows the email address I've solely dedicated for my Ello account.
And the email contains a couple of links which look like this:
So much about privacy.