How to send vb.net windows application email over proxy server?

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VB

Visual-Studio

Hello,

I need to create a small report to be send automaticliy from VB.NET Windows application. I have wrote below code which is working on my private PC, and with Gmail settings, such as username + password + smtp.gmail.com, etc...

But with, my work informations, like my proxy ID + proxy password + company smptserver + port 25, does not working .

Do I missing some lines in my 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
        Dim Mail As New MailMessage
        Mail.Subject = "test email"
        Mail.To.Add("emailaddress")
        Mail.From = New MailAddress("emailaddress")
        Mail.Body = TextBox1.Text
        Dim SMTP As New SmtpClient("smtpserver")
        SMTP.EnableSsl = True
        SMTP.Credentials = New System.Net.NetworkCredential("username", "password")
        SMTP.Port = 25
        SMTP.Send(Mail)
    End Sub

Thank you in advance for help.