451 Reject due to policy restrictions

Reason

It has been determined that a massive amount of email spam has been sent to our customers via the mail system you use in connection with your DKIM domain.

In order to reduce the further receipt of email spam - DKIM signed with your domain - and to protect our customers from it, existing privileges for your system and your domain have been suspended and the further acceptance of emails has been refused.

Solution

Please take all necessary measures to prevent misuse of your system in order to prevent unwanted connections and spam.

You can then contact us using the form on this page.

If possible, please provide us with all helpful information for the processing of your inquiry:

  • complete error message
  • DKIM domain you use to sign your emails
  • IP addresses, IP ranges (CIDR), AS



See also: General information on our error messages.