通过 Gmail SMTP 发送电子邮件时出错

Question

基本上我尝试在按下按钮时发送电子邮件。

使用以下代码，我收到一条错误消息，提示“SMTP 服务器需要安全连接或客户端未通过身份验证”。

是什么导致了这个错误？

Imports System.Net.Mail    

   Private Sub Button1_Click_2(sender As Object, e As EventArgs) Handles Button1.Click
    Try
        Dim SmtpServer As New SmtpClient()
        Dim mail As New MailMessage()

        SmtpServer.Credentials = New  _
    Net.NetworkCredential("MYEMAIL@gmail.com", "MYPASSWORD")
        SmtpServer.EnableSsl = True
        SmtpServer.DeliveryMethod = SmtpDeliveryMethod.Network
        SmtpServer.UseDefaultCredentials = False
        SmtpServer.Port = 587
        SmtpServer.Host = "smtp.gmail.com"
        mail = New MailMessage()
        mail.From = New MailAddress("MYEMAIL")
        mail.To.Add("SENDINGADRESS")
        mail.Subject = "Test Mail"
        mail.Body = "This is for testing SMTP mail from GMAIL"
        SmtpServer.Send(mail)
        MsgBox("mail send")
    Catch ex As Exception
        MsgBox(ex.ToString)
    End Try
End Sub

Answer 1

你已经很接近了，你还需要设置以下属性。

SmtpServer.EnableSsl = True
SmtpServer.DeliveryMethod = SmtpDeliveryMethod.Network
SmtpServer.UseDefaultCredentials = False