Hi ,
The logic behind regional language is that convert the 
regional text into unicode (the language supported by 
browser)and this can be done through language converters.

Second way to do is make .eot or .pfr files of your font 
and access that file in your asp.net page.
You have to download WEFT by which you can make eot files 
of your font.
just search in google or you can get it on microsoft site 
also.
just do as given below.

*********************************
//In head tag of page add this code 
<style type="text/css" >

  @font-face 
  {
    font-family: AkrutiDevYoginiUnicode;//Converted font 
name
    font-style: italic;
    font-weight: normal;
    src: url(AKRUTID0.eot); //Your eot file.
   }

</style>


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but how to embed eot file while sending mail in asp.net