SPF records
Information about the permissible posts of mail for the domainv=spf1 a mx include:_spf.google.com include:spf.mindbox.ru include:spf.mailigen.com include:amazonses.com ip4:92.53.116.0/22 ip4:92.53.96.0/22 ip4:92.53.112.0/22 ip4:92.53.104.0/22 ip4:94.25.109.194/27 include:_spf.dashasender.ru ip4:94.25.109.194 ~all