I am Working on yammer API to Sends an email invitation to a user who has not yet joined the current user’s yammer network.
By using this URL
In User Information: After Sign In with my organization mail id it generate one token than passed the parameter of email (ddd@gmail.com) Here which i passed mail id is invalid, but status is "OK" Here how to check mail id is valid or not and exists or not in C# code can any one help me here