SPF records
Information about the permissible posts of mail for the domainv=spf1 a mx ip4:185.164.173.132 ip4:91.189.116.21 ip4:91.189.116.22 ip4:91.189.116.23 ip4:91.189.116.24 ip4:91.189.116.25 ip4:91.189.116.26 ip4:91.189.116.27 ip4:91.189.116.28 ip4:91.189.116.29 ip4:31.177.93.241 ip4:31.177.93.242 ip4:31.177.93.243 ip4:31.