If this application has worked before on another machine, then you need to
look at what changed.  Is the Vista machine on a different domain
(sub-domain perhaps)?  Is it in a different IP address range?  Something in
the configuration has to be different about that machine that is causing the
mail server to deny your e-mail request.

...Glenn
On Fri, Oct 17, 2008 at 8:06 AM, peraSKK <[EMAIL PROTECTED]> wrote:

>
> Our Outlook is sending the mail via SMTP.
>
> I have tried to provide a port number but no success on that either.
> I get the same "Invalid address" message.
> ...
> Dim smtp As New System.Net.Mail.SmtpClient("xxx.xxx.xxx.xxx", 25)
> ...
>
> If I tried to write an invalid ip-address or port number, then I get:
> "An error occurred while sending mail"
>

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