cant find the solution

Question

Hi all,
i have a simple Problem. i have written a code in asp.net for sending email.
my code is working fine. but
entire body content is not going only 1000 bytes are going. above 1000 bytes all are truncted. i want my mail message to carry >1000 bytes.
the error i think are as follows:

X-Mailer : Microsoft CDO for Windows 2000
IPlanet-SMTP-Warning  Lines longer than SMTP allows found and truncated.

but for gmail,yahoo...etc . if i send, all the contents of mail are going.but if i send it to vsnl.net it is accepting only a max of 1000 bytes.
can anyone guide/suggest me to do that.
it is very urgent because all the people who r using othersites except vsnl, they r getting mails and vsnl.net people are not getting entire messge.

my code is as follows:
using System.Web.Mail;
using System.Text;  
using System.IO;

MailMessage mail = new MailMessage( );
mail.To = "[email protected]" ;
mail.From = "[email protected]"  ;
mail.Subject = "Test Mail" ;
mail.BodyFormat = MailFormat.Text;

mail.Body =nizam;  //string builder nizam carrying >1000 bytes
 
SmtpMail.SmtpServer.Insert(0,"127.0.0.1");
SmtpMail.Send( mail );

Thanks in advance,
nizam.