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You just have to verify your email address in SES (https://docs.aws.amazon.com/ses/latest/DeveloperGuide/verify...) and then you can use SES to send emails on your behalf. You might also want to send a support ticket to get you out of their sandbox environment as it has a lot of restrictions. And then its very simple with Boto3 for example: https://pastebin.com/raw/hC6ihZZx

Here is the script I've been using [1].

[1] https://github.com/arithmetric/aws-lambda-ses-forwarder

I'm curious about that as well. Does he have a Lambda that sends email he gets to a spool file somewhere? What does that workflow look like? Whats the advantage over just using a regular email client or Gmail?

The advantage is collecting email from disparate addresses (e.g. admin@your-domain.com) and forwarding them all to your preferred Gmail accounts. You can't setup ACM or other certs services without that to prove ownership. Previously I paid ~$100/yr to get all these mail forwarding routes setup. You can also capture inbound mail directly to a queue (e.g. unsubscribe@your-domain.com) and feed it to a Lambda to take action.

If you need simple email forwarding you can use this https://forwardemail.net (it's FOSS)