在不行的电脑安装一个试用版，然后打开，运行下面代码看能否发送
Dim client As New System.Net.Mail.SmtpClient()
client.Host = "smtp.qq.com"
client.Credentials = New System.Net.NetworkCredential("455189993@qq.com", "helen6849338.")
client.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network
Dim message As New System.Net.Mail.MailMessage
message.From = new System.Net.Mail.MailAddress("455189993@qq.com")
message.To.Add("765427475@qq.com")
message.Subject = "主题测试"
message.BodyEncoding = System.Text.Encoding.UTF8
message.IsBodyHtml = True
Dim body As String = "<html><body>内容</body></html>"
Dim content As String = "<table border=1><tr><td>第一列</td><td>第二列</td><td>第三列</td></tr><tr><td>1</td><td>2</td><td>3</td></tr><tr><td>aaa</td><td>bbb</td><td>ccc</td></tr></table>"
message.Body = body.Replace("内容", content)
Try
client.Send(message)
msgbox("发送成功")
Catch ex As Exception
msgbox("发送失败:" & ex.message)
End Try
加好友 
发短信
Post By：2017/12/7 14:12:00 [只看该作者]
