For the given mail id, how to retrive the full name ?

For example
John Thomas

I am doing a program in ASP.net with C#.
I will be having the mail id as , I would like to have the
full name, that is "John Thomas". So that, Programatically I can write a mail
as follows,

John Thomas,
Content......

as I am not getting the full name now I am writting as

,
Content.............

is it possible?

to make it more clear,

My site is an intranet site. All the user will have their domain id as same
as their email id. for example,

John.t is the domain id and is his mail id.
So If I am using the outlook I can enter the John.t and press Ctrl + K , it
will fetch me the john Thomas.

Now I am having the domain id "john.t" now would like to have the full name?

{in my previous posting I used yahoo as example, please don't get confused}



"Ramesh" wrote:

For the given mail id, how to retrive the full name ?

For example
John Thomas

I am doing a program in ASP.net with C#.
I will be having the mail id as , I would like to have the
full name, that is "John Thomas". So that, Programatically I can write a mail
as follows,

John Thomas,
Content......

as I am not getting the full name now I am writting as

,
Content.............

is it possible?