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