SPF records
Information about the permissible posts of mail for the domainv=spf1 +ip4:185.81.251.13 +ip4:213.85.34.238 +ip4:89.222.165.14 +ip4:93.95.100.221 +ip4:93.95.100.222 +a:cloud.itone.ru +a:office.itone.ru include:_spf.google.com include:spf.unisender.com include:_spf.masterhost.ru -all