NewSESSender returns a SESSender which sends email via Amazon SES.

LogSender implements Sender interface which logs the email, token and challenge to stderr and forwards to the wrapped Sender.

MemEmail implements Sender interface to be used for testing.

See https://pkg.go.dev/github.com/aws/aws-sdk-go/service/ses#SendTemplatedEmailInput for details.

SESSender implements Sender interface using AWS SES.