SPF records
Information about the permissible posts of mail for the domainv=spf1 ip4:151.248.112.131 ip4:176.99.4.106 include:_spf.google.com +a +mx include:_spf.emailtransfer.net include:_spf.elasticemail.com include:_spf.dashasender.ru include:_spf.mail.ru ~all