554 Transaction failed Reject due to policy restrictions

Reason

To reduce spam email reception, we use different block lists.

Your emails have been rejected because they contain a URL with a domain which is listed on the Spamhaus.org DBL block list.

Solution

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

To check if the Domain of the URL is still blocklisted or to get additional information about the delisting process, please use the following link: https://check.spamhaus.org/