Help with a Hotmail app.

[MaNgE]

Hello! I am not sure where to post this but hopefully this is right.

So basicly I watched a tutorial on how to make a form that sends to an email.
But now im having a problem. It wont send the email. It's pretty wierd because it worked before and now it doesn't work at all.

Here is the code,

Imports System.Net.Mail
Public Class Form1

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        If TextBox1.Text = "" Then
            MsgBox("ERROR")
        Else
            If TextBox2.Text = "" Then
                MsgBox("ERROR")
            Else
                Dim message As New Net.Mail.MailMessage(Label4.Text, Label4.Text, Label6.Text, TextBox1.Text)
                Dim smtp As New Net.Mail.SmtpClient("smtp.live.com", 587)
                Dim credentials As New Net.NetworkCredential(Label4.Text, Label5.Text)
                smtp.EnableSsl = True
                smtp.Credentials = credentials
                smtp.Port = 587
                smtp.Host = "smtp.live.com"
                smtp.Send(message)
                MsgBox("Success")
            End If
        End If
    End Sub
End Class

The error that comes up is this:

Mailbox is not available. Server Response: 5.3.4 Requested action not taken;
To continue sending messages, please sign in to your account.

I do really want to know what's wrong, it's so wierd because when i first made this, it worked perfectly but now it doesn't work anymore.

Just so you guys know, im sending the email to my own account.

 

[DalexL]

"To continue sending messages, please sign in to your account."

Are you logged in. Have you specified any account details. I don't know much about this kind of stuff, but have you given it the requirements for utilizing the account (i.e. Username and Password)?