SPF records
Information about the permissible posts of mail for the domainv=spf1 ip4:195.206.53.26 ip4:195.206.39.204 ip4:176.57.209.8 ip4:176.57.223.0/24 ip4:92.53.116.0/22 ip4:92.53.96.0/22 ip4:92.53.112.0/22 ip4:92.53.104.0/22 ip6:2a03:6f00::/32 ~all