大家好：
昨天更换了核心交换机CISCO3750换成CISCO4506，但换完之后在局域网内收发POP、SMTP邮件都没有问题，服务器是EXCHANGE，设置也没有更改过。但今天在外面收邮件却提示下图，不知为何，请高手指教。
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Channel:
Fórum Exchange Server
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Channel Details:
- Title: Fórum Exchange Server
- Channel Number: 4384187
- Language: Chinese
- Registered On: September 11, 2012, 1:01 pm
- Number of Articles: 11117
- Latest Snapshot: August 11, 2023, 9:10 pm
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- Description: Exchange Server 安装,应用,管理,运维 版主：钉子, 格瓦拉, Jimmy_xu, KeJiaLi, YangHui
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