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This is correct. SMTP is blocked by default and you have to ask for this to be removed.
Details can be found here https://repost.aws/knowledge-center/ec2-port-25-throttle
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Thank you so much for the kind answer. I'll follow what stated in that page. Is it the same when connecting to remote port 587? Thank you.
Im pretty sure it may also be blocked and requires the same process. I think it’s also a port on SES that’s blocked until you move to production out of sandbox.