我正在尝试从我的 vb.net 表单应用程序发送 SMTP 电子邮件。应用此代码时,我收到以下错误。我究竟做错了什么?
代码:
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("myemail@gmail.com", "mypassword")
SmtpServer.Port = 587
SmtpServer.Host = "smtp.gmail.com"
mail = New MailMessage()
mail.From = New MailAddress("myemail@gmail.com")
mail.To.Add("sendto@hotmail.co.uk")
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
End Class
错误:
System.Net.Mail.SmtpException:SMTP 服务器需要安全连接或客户端未通过身份验证。服务器响应为:5.7.0 必须先发出 STARTTLS 命令