SPF records
Information about the permissible posts of mail for the domainv=spf1 ip4:5.101.153.46 ip4:144.76.2.203 ip4:144.76.2.177 ip4:136.243.247.218 ip4:188.94.91.128 ip4:188.120.225.138 include:spf.unisender.com include:servers.mcsv.net include:_spf.yandex.ru a mx ~all