@ converted to %40 in HTTPPost request

i m trying to send post request to webservice.. when i add special character @ in parameter it is coverted to %40.i have checked server side..they are getting %40 instead of @. can any one help me?? here is my code..

httpclient = new DefaultHttpClient();
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("Email", "[email protected]"));


httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
 ResponseHandler<String> responseHandler = new BasicResponseHandler();
String response = httpclient.execute(httppost,responseHandler);

i have also tried this method to prevent my parameter from encoding.

httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs, HTTP.PLAIN_TEXT_TYPE));

but it raised unsupported encoded algorithm

pls help me out of this.