Reason
Your e-mails have been rejected by our mail system because the information provided in the e-mail header does not comply with our policy.
The header field "List-Unsubscribe" appeared too often.
Solution
Our system accepts multiple "List-Unsubscribe" header fields, but only up to a certain threshold.
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.