Imports github.com/miekg/dns github.com/StackExchange/dnscontrol/v2/models github.com/StackExchange/dnscontrol/v2/pkg/spflib github.com/StackExchange/dnscontrol/v2/pkg/transform github.com/StackExchange/dnscontrol/v2/providers github.com/miekg/dns/dnsutil Standard library imports fmt net strings