How to send email using asp.net without using username and password parameters in web.config?

Question

Hi,

My client's website has a 'Contact Us' page and I am sending all the information collected via  this page to his email id. 

The web config file of the website looks like this - 

<mailSettings>

<smtp deliveryMethod="Network"> 

<smtp>

<network host="" port="" userName="" password=""/>

</smtp>

</mailSettings>

Is there any other way through which I can send the email WITHOUT using userName and password parameters?

Thanks,