I have implemented the DNSLookup.cs code that graciously shared on C#Corner and others by Mr. Bill Andreozzi. The code works perfectly (thank you), but now I have the need to be able to pass in the IP addresses of the DNS Server(s) I would like to use (to make the MX request) rather than the default DNS Server on the application's server. We would like to use the opendns.com server addresses as the 4th parameter in the dnsquery method of dnsapi.dll. 208.67.222.222 208.67.220.220 But I cannot seem to get that passed to the unmanaged code. Using the code for DNSLookup.cs here, is there a way to over-ride the default DNS Server for an MX lookup to use specific DNS Server(s)?
Thank you for your time and knowledge.
Patricia Hindes