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默认情况下,作为防止垃圾邮件的措施,Amazon EC2 会限制实例的端口 25。AWS 会阻止所有 EC2 实例和 Lambda 函数通过端口 25(SMTP)的出站流量。要通过端口 25 发送出站流量,需请求 AWS 取消该限制。具体请参考https://repost.aws/zh-Hans/knowledge-center/ec2-port-25-throttle
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