I got a message from my domain service:
During the periodic DNS Black List, we detected that a server hosting your domain was included in one of them. On date: December 23, 2019 16:09
https://www.spamhaus.org/sbl/query/SBL466807
Nameservers is:
dns1.p01.nsone.net
dns2.p01.nsone.net
dns3.p01.nsone.net
dns4.p01.nsone.net
IP: 134.209.226.211
Any help?