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我已使用以下代码成功发送电子邮件：

   Friend Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
      Try
         Dim Smtp_Server As SmtpClient
         Dim e_mail As MailMessage
         Smtp_Server = New SmtpClient()
         Smtp_Server.UseDefaultCredentials = False
         Smtp_Server.Credentials = New Net.NetworkCredential("myuserid@gmail.com", "mypassword")
         Smtp_Server.EnableSsl = True
         Smtp_Server.Port = 587
         Smtp_Server.Host = "smtp.gmail.com"

         e_mail = New MailMessage()
         e_mail.From = New MailAddress(txtFrom.Text)
         e_mail.To.Add(txtTo.Text)
         e_mail.Subject = "Email Sending Subject"
         e_mail.IsBodyHtml = False
         e_mail.Body = txtMessage.Text  ''Take from textbox

         attachment = New System.Net.Mail.Attachment("D:\mypdfdoc.pdf")
         e_mail.Attachments.Add(attachment) 'attachment
         Smtp_Server.Send(e_mail)
         MsgBox("Mail Sent")

      Catch error_t As Exception
         MsgBox(error_t.ToString)
      End Try
   End Sub

但是当我附加一个文件时：

attachment = New System.Net.Mail.Attachment("D:\mypdfdoc.pdf")
             e_mail.Attachments.Add(attachment) 'attachment

它引发错误：System.Net.Mail.SmtpException：操作已超时。在 System.Net.Mail.SmtpClient.Send（MailMessage 消息）

（没有附件它可以通过从谷歌帐户启用不太安全的应用程序来正常工作）什么样的解决方案可用呢。

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