Thanks for the solution ...

I am providing this command in a C program.

sprintf( cmd, "elm -s SUBJECT %s <<HERE \n %s \n [include %s text/plain base64] \n HERE ", emailAddr, sMailBody, sFileName );

This is sending the [include %s text/plain base64] part also in the email body along with the actual body text. And there is no file attached in the email.

Could you please help me with this ???