Is there any way I can use NetworkCredential class feeding it with a username only and not with a password?

Thank you very much!

what is that you are trying to achieve. Will be usefull to know, to point you into right direction..

I am building an asp.net application and I want to be able to send email using this application.

I have just setup the iis7 smtp server which is waiting for an anonymous connection from the same machine that the application resides (127.0.0.1) so I want to be able to send email without using a username and password.

 Thank you very much for your immediate response!

I dont think you need to pass any network credentials to run your email code on your server. Can you post your code?