SPF records
Information about the permissible posts of mail for the domainv=spf1 a mx ip4:92.242.54.75 ip4:213.33.179.251 ip4:213.33.179.254 ip4:178.159.255.42 ip4:77.247.243.29 ip4:92.242.54.78 include:spf.mandrillapp.com include:spf.protection.outlook.com include:_spf.dashasender.ru include:_spf.elasticemail.com ~all