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I'm not sure that's true, I've successfully dispatched SMTP mail from their platform without it getting blocked or tagged as spam.

To be fair, the ratio of spam received from EC2 has dropped in the last month, something has definitely changed (or I'm not a target since then).

I'll let you know.

You can send using SES or SNS but if you send from your own EC2 instance you are gonna have a bad time.