Three possible solutions, in order of preference: Find a different DNS provider, that will allow you to put an MX on a subdomain. Note that this does not necessarily require you to change registrars. Use your base domain with mailgun, perhaps utilizing their forwarding feature to send incoming mails to whoever hosts your mailboxes. Use … Read more
if you need just catch email on domain and forward to you other mailbox, you can use http://improvmx.com/ just by adding MX records to your domain
Update 2018/5/23: Check out MichaC’s answer for a newer library that has .NET standard support. Original Answer: The ARSoft.Tools.Net library by Alexander Reinert seems to do the job pretty well. It’s available from NuGet: PM> Install-Package ARSoft.Tools.Net Import the namespace: using ARSoft.Tools.Net.Dns; Then making a synchronous lookup is as simple as: var resolver = new … Read more