Zoho Desk- Is there any option to have a preferred screen name.

I recently created Zoho Desk Portal and found that when someone replies to ticket in my portal then instead of show his/her name, there shows xyz( if his mail id is xyz@gmail.com and name is Zammy) as screen name, and also in response email from noreply@zohodiscussion.com.

For example-

You(say Name-Sam with mail id- abcd@gmail.com) posted and idea/post in my portal and someone(say Name- Kelvin with mail id xyz@gmail.com) has replied/commented to your post. Then you and i will receive a email from " noreply@zohodiscussion.com" mentioning that

Hi abcd,

xyz has responded to "POSTED TOPIC NAME"

I don't why the names are not displaying if there is name for every mail id in their account.

This is serious threat to privacy leak because anyone can guess the maild id from the initials.

Please can i get any answer to solve this problem?