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Port 25 is blocked by default to try and prevent spamming.
You can request for the port to be opened, the steps are here https://repost.aws/knowledge-center/ec2-port-25-throttle
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- AWS 공식업데이트됨 7달 전
Port 25 is blocked by default to try and prevent spamming.
You can request for the port to be opened, the steps are here https://repost.aws/knowledge-center/ec2-port-25-throttle
Requested but they do not allow it, neither they clarify the reason. And they keep in the dark.