The SMTP Server requires a secure connection or the client was not...

So I'm making a Program to Start/Restart/Stop and running commands from the Console for my Server.
Now when someone uses the console, I want to be alerted of it on my Mail.
I am using Visual Studio 2010.
This is my Code:

        Dim mail As New MailMessage
        Dim smtp As New SmtpClient
        Try
            mail.From = New MailAddress("[e-mail]")

            mail.To.Add("[e-mail]")

            mail.Subject = ("Text")


            mail.Body = ("Some other Text")

            Dim s As New SmtpClient("smtp.gmail.com")

            s.Port = 587

            s.EnableSsl = True

            s.Credentials = New Net.NetworkCredential("[e-mail]", "password")

            s.Send(mail)

        Catch ex As Exception
            MessageBox.Show(ex.Message)
        End Try

Of course I hidden some of my personal informations but this is it, when I'm clicking on the button, I get THIS error:

The SMTP Server requires a secure connection or the client was not authenticated.
The server response was: 5.5.1 Authentification required. Learn more at

I have another Program that does the same on VB 2008, and it works fine.
Any help would be very appreciated.
Thank you in advance!

[poojavb]

    Dim SmtpServer As New SmtpClient()
    Dim mail As New MailMessage()
    SmtpServer.Credentials = New Net.NetworkCredential("[e-mail]", "abc123def")
    SmtpServer.Port = 25
    SmtpServer.Host = "mail.google.com"
    mail = New MailMessage()
    mail.From = New MailAddress("[e-mail]")
    mail.To.Add("[e-mail]")
    mail.Subject = "Testing"
    mail.Body = subject
    SmtpServer.Send(mail)
    MsgBox("mail sent sucessfully")

Ur connections are correct...try putting ur credentials at first...the above code works for me.....