For twitter authentication,it is notified as....
Twitter integration requires the generation of dummy email addresses for authenticating users.
Please check with your domain administrator as this may require changes to your mail server.
Could you please let me know what changes does it need to change? I can change them by myself or ask the webhost to configure accordingly
Currently, I have enabled the option and did not make any changes on server. So when a user login using Twitter connect...he is redirecting to the same ' wp-login ' page and nothing further