The below section is only for existing users. New users (who have registered after 12-Nov-2019) will have to create an AWS Role instead of using AWS Keys.
SECURITY OF YOUR AWS KEYS: Your AWS keys are encrypted both in transit and at rest. At any time, you can delete your keys, generate a new set of keys (using the same process as above) and input your new keys into Send With SES. You will not lose your data.
It is recommended you periodically rotate your AWS Keys.