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I'm in sandbox mode.
When I send the email in the "Test email (s)" field it works normally.
When I try to send through the field "Choose your lists & segments" you don't send, what could be happening?
You'd need to move out of sandbox mode by filling up the request form → http://aws.amazon.com/ses/extendedaccessrequest
As written in Step 5 of the Get Started Guide