代码如下
<%
Set JMail = Server.CreateObject("JMail.SMTPMail")
JMail.ServerAddress = "mail.web5u.com:25"
JMail.Sender = "test@web5u.com"
JMail.Subject = "jmail 测试"
JMail.AddRecipient "info@web5u.com"
JMail.Body = "测试成功"
JMail.Priority = 1
JMail.Execute
%>

当JMail.AddRecipient "info@web5u.com" 时就可以正常发信
当我改成JMail.AddRecipient "gzmmf@163.com" 就出现

jmail.SMTPMail 错误 '8000ffff'

The message was undeliverable. All servers failed to receive the message

为何