This seems an extraordinary attempt at a solution to phishing, from Germany. Customers must click a symbol in an email to validate that the email is genuine. This makes no sense, because if the email is not genuine, then by the time the click is made, it is too late.

Finextra: Deutsche Postbank introduces electronic signatures

The digital certificate is issued by TC Trust, the German subsidiary of GeoTrust. By clicking on the symbol in the e-mail, customers can see whether the e-signature is valid. If something is incorrect in the signature, a warning message appears on screen

Relevance to Bankwatch:
We will have to await more specifics on this, but first evaluation based on this announcement, suggests it is seriously flawed.