作者： Yue Li

“Your message couldn’t be delivered because you weren’t recognized as a valid sender. The most common reason for this is that your email address is suspected of sending spam and it’s no longer allowed to send email. Contact your email admin for assistance. Remote Server returned ‘550 5.1.8 Access denied, bad outbound sender.”

您的消息无法送达，因为您未被识别为有效发件人。最常见的原因是您的电子邮件地址被怀疑发送垃圾邮件，因此不再允许发送电子邮件。请联系您的电子邮件管理员寻求帮助。远程服务器返回“550 5.1.8 访问被拒，发件人不良。”

管理中心网址 https://admin.microsoft.com/