使用SMTP

Question

我真的开始对通过VB.NET发送电子邮件（例如：test@test.com）并确定使用SMTP感到困惑。

我希望在单击Button1时发送邮件（示例）。

所以我开始使用类似的代码

Imports System.Net.Mail

Public Class MyProgram

    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        Using message As New MailMessage()
            'set to the from, to and subject fields
            message.From = New MailAddress("sender@sender.com")
            message.[To].Add(New MailAddress("test@test.com"))
            message.Subject = "Test"
            'code the message body
            Dim MsgBody As String
            MsgBody = TextBox1.Text.ToString() & vbCr & _
                      TextBox2.Text.ToString()
            message.Body = MsgBody
            Dim client As New SmtpClient()
            client.Host = "smtp.example.com"
            client.Port = "465"
            client.EnableSsl = True
            client.Credentials = New Net.NetworkCredential("USERNAME@MAIL.COM", "PASSWORD")
            client.Send(message)
        End Using
        'display submitted box
        MessageBox.Show("Congrats", "Congratulations!")
        'close form
        Me.Close()
    End Sub
End Class

我得到了：

接下来，我尝试了另一个代码（即）...

Imports System.Net.Mail

Public Class MyProgram

    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        Dim Smtp_Server As New SmtpClient
        Dim e_mail As New MailMessage()
        Smtp_Server.UseDefaultCredentials = False
        Smtp_Server.Credentials = New Net.NetworkCredential("USERNAME@MAIL.COM", "PASSWORD")
        Smtp_Server.Port = 465
        Smtp_Server.EnableSsl = True
        Smtp_Server.Host = "smtp.example.com"

        e_mail = New MailMessage()
        e_mail.From = New MailAddress("sender@sender.com")
        e_mail.To.Add("test@test.com")
        e_mail.Subject = "Test E-mail Address Sent by My Program"
        e_mail.IsBodyHtml = False
        e_mail.Body = "Test"
        Smtp_Server.Send(e_mail)
        MsgBox("Mail Sent")
    End Sub
End Class

现在我在调试器中得到以下内容：

最后，电子邮件没有被发送！

请不要说＆＃34; sender@sender.com"没有被配置为发件人电子邮件地址，因为它是！

我真的需要帮助！

感谢。 ： - ）