Get SMTP name by passing domain name in c#?

Question

Hi Team I have very basic question i have a domain name for example yahoo.in with me. Now i want to pass that domain name and get SMTP mail server name for example smtp.mail.yahoo.com. I want to get this by c# code. My intention behind this i have multiple of email addresses so i will pass domain name for a requested email address and fetch SMTP mail server name. Please suggest code to get SMTP name by domain name. Thanks in advance.

pritaeas · Answer

That is not possible. That information is usually hidden to avoid direct attacks. You can query for the SMTP server within your own domain but not for any arbitrary one. Assuming it was possible there is no way to retrieve the login credentials for that server to allow you to send an e-mail. It is even more likely that external access to that SMTP server is blocked anyway to avoid relaying.