How to make Autogenerated mail

 Hi friends,
I am making one website, where i have to autogeneated a mail for eg...
I am on the leave for a week. If someone mailed me, an autogeneraed mail should go to that sender that i am not at a station for a week...
How to develop in web application..I am using C#,ASP 2.0.
Any help is appreciated.
 
Thanks
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