I am working on an IMAP implementation using AWS API gateways in which I have to retrieve e-mails from a S3-bucket and get them into an e-mail client somehow, but I've not been able to find which requests those clients send when you try to retrieve e-mails from another source. My guess is GET-requests, but I'm honestly not even sure if it's REST-requests that are being sent. Does anyone have an idea?

Thanks in advance!