550 Requested action not taken: mailbox unavailable Reject due to policy restrictions

Reason

To reduce spam email reception, we use different blocklists.

Your emails have been rejected because the sending server's From Domain (RFC 5322.From) was listed on a Spamhaus.org blocklist. Exceptions are not possible.

Solution

Please take necessary actions to stop spam transmission.

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