SPF records
Information about the permissible posts of mail for the domainv=spf1 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 ip4:185.200.241.213 ip4:89.223.124.229 ip4:92.53.104.0/22 include:mxsspf.sendpulse.com ip6:2a03:6f00::/32 include:_spf.masterhost.ru a:midacompany.ru ~a