Fake Email Sender

[kalo93]

I have this code to send an email:

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 msgTo.Text = "" Or msgFrom.Text = "" Or msgSubject.Text = "" Or msgBody.Text = "" Or smtpHost.Text = "" Or smtpPort.Text = "" Then
            MsgBox("You must fill out everything!", MsgBoxStyle.Information, "Error")
            Exit Sub
        End If
        On Error GoTo msgError
        Dim smtpServer As New SmtpClient()
        Dim mail As New MailMessage()
        smtpServer.Credentials = New Net.NetworkCredential("email", "password")
        smtpServer.Port = smtpPort.Text
        smtpServer.Host = smtpHost.Text
        If SSL.Checked = True Then
            smtpServer.EnableSsl = True
        Else
            smtpServer.EnableSsl = False
        End If
        smtpServer.EnableSsl = SSL.Checked
        mail = New MailMessage()
        mail.From = New MailAddress(msgFrom.Text)
        mail.To.Add(msgTo.Text)
        mail.Subject = msgSubject.Text
        mail.Body = msgBody.Text
        smtpServer.Send(mail)
        MsgBox("Email was sent to:" & msgTo.Text)
        Exit Sub
msgError:
        MsgBox("Couldn't send email, please make sure the SMTP Settings are correct.", MsgBoxStyle.Critical, "Error")
    End Sub

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        smtpHost.Text = "smtp.live.com"
    End Sub
End Class

But obviously, it sends them an email from the email that requires the password.

But I want to send emails that appear from what's entered in the 'from' textbox.

How would I go about that?