MAIL FROM 命令失败:Authentication requireds什么意思

standard authentication什么意思 first electronic mail from china to germany什么意思 E-mail什么意思 authentication You are not authorized to send mail,authentication is requir e-mail account什么意思 E-mail 什么意思呢? ant命令下面这段什么意思? {current} 在命令里什么意思 no response from the authentication server unable to connet my e-mail address什么意思 提问老失败什么意思