Kirim Email Menggunakan VB.NET

Imports System.Net.Mail
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Try
Dim SmtpServer As New SmtpClient()
Dim mail As New MailMessage()
SmtpServer.Credentials = New Net.NetworkCredential("username@gmail.com", "password")
SmtpServer.Port = 25
SmtpServer.Host = "smtp1.jetcoms.net"
mail = New MailMessage()
mail.From = New MailAddress("Kuntilanak@Kuburan.com")
mail.To.Add("Emailtujuan")
mail.Subject = "EMAIL !"
mail.Body = rtb1.Text
SmtpServer.Send(mail)
MsgBox("mail send")
Catch ex As Exception
MsgBox(ex.ToString)
End Try
End Sub
End Class