Send email using Distribution List(DL) in asp.net 1.1

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ASP.NET

Hi all,

I have a code below sending email to the Distribution list(DL).But one of the recipient email address is invalid in the DL.I was unable to send the email to the valid email addresses atleast.

My question is how can i send the email to valid recipients in .net 1.1 even if there is invalid email address in the DL.I am getting the exception like this:
The server rejected one or more recipient addresses.

code in 1.1

Dim mail As New MailMessage()
mail.To = "abc_DL@one.com"
mail.From = "strust@one.com"
mail.Subject = "This is test mail"
SmtpMail.SmtpServer = "smtp.one.com"
SmtpMail.Send(mail)

But in my sample code below 2.0 application i am able to send the email to the recipients with correct address even if there is wrong address(junkmail@one.com)along with the DL mentioned

code 2.0
Namespace used

Imports System.Net.Mail

Dim mail As New MailMessage()
mail.[To].Add(abc_DL@one.com,junkmail@one.com)
mail.From = New MailAddress(strust@one.com)
mail.Subject =This is test mail to the distribution List
mail.Body = This is a test mail.Please ignore
Dim smtp As New SmtpClient(smtp.one.com)
smtp.Send(mail)

Thanks,
Priya