Been sending emails from my C# application for awhile now. But tried tonight, and its not working. Been googling but have to come across anything anything with the exception message I am getting.Been sending emails from my C# application for
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GMail邮箱不可用。服务器响应是：5.7.1该消息包含未经授权的自定义地址，因为
来源：互联网
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