// Using DnsClient nuget package
            
            var client = new LookupClient();

            var textRecords = client.Query("google.com", QueryType.TXT).AllRecords.TxtRecords();
            var spfRecords = textRecords.Where(x => x.EscapedText.Any(t => t.Contains("spf")));

            foreach (var spfRecord in spfRecords)
            {
                foreach (var text in spfRecord.EscapedText)
                {
                    Console.WriteLine(text);
                }

                
            }