Format message from contact form

I have contact form which is sending email.

But if I type a long message in the text area and after clicking submit, in my email this message displaying in single line.

e.g if开发者_Python百科 i type that in Message text area:

My super Mesasge 
My Mesasge Mesasge

From Test.

In my email box it will be like:

My super Mesasge My Mesasge Mesasge From Test.

Why the formatting("/r/n") getting lost and how could i keep the formatting of that message?

UPDATE: I used AntiXSS.4.0.1 e.g: model.Message: "sdfsdf\r\nsdfsdf\r\nsdfsdfsdafsdfa"

I did that:

    model.Message = model.Message.Replace("\r\n", "<br />");
   //result: model.Message="sdfsdf<br />sdfsdf<br />sdfsdfsdafsdfa"

Than:

     model.Message = Sanitizer.GetSafeHtmlFragment(model.Message);
    //result: model.Message="sdfsdf<br>\r\nsdfsdf<br>\r\nsdfsdfsdafsdfa"

So why Sanitizer.GetSafeHtmlFragment added \r\n back? and it is changed also <br /> to <br>

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The only thing I can think of, is that your email format is in HTML, so the the NewLine should be converted in <p></p> tag or <br />

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This will depend on how you are sending the email. If you use HTML (message.IsBodyHtml) then you need to replace \r\n with <br/> when populating the message.Body.