Reason
Your e-mails have been rejected by our mail system because the information provided in the e-mail header does not comply with the specifications in RFC 6376.
The DKIM-Signature is syntactically not correct.
Solution
Please make sure that the requirement for the header field "DKIM-Signature" is fulfilled.
As soon as the corrections have been made by you, you can deliver emails to our system again.
See also: General information on our error messages.