你好,
根据描述,可能是用户是默认通过匿名验证的方式连接的SMTP服务,建议你将default frontend连接器中的“Exchange用户”也勾选上,然后重启服务器后,再次勾选SMTP需要验证选项来进行配置。
谢谢!
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Niko Cheng
TechNet Community Support
