You will receive the following error message via mail:

NON DELIVERY REPORT X-Postfix; bad address Syntax

This error message indicates that your trading partner has specified a non-existent communication address. The message cannot therefore be delivered.

Please contact the trading partner and inform him/her that he/she sends us a functioning communication address in writing via mail or post. Unfortunately, for legal reasons you cannot accept this. The change instruction must come directly from the account owner.