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SMTP 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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SMTP 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