SPF records
Information about the permissible posts of mail for the domainv=spf1 ip4:31.184.227.66 ip4:31.184.227.67 ip4:95.143.186.163 ip4:77.223.127.147 ip4:77.223.127.153 ip4:95.143.186.162 ip4:31.184.227.68 ip4:77.223.127.150 include:_spf.yandex.net include:_spf.google.com include:spf.unisender.com include:mail.smsce