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AWS IP addresses are blacklisted by most email providers...

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

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

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 have to request an rDNS record. It should get through Gmail if you do that, DKIM, SPF, and of course don't send actual spam.