When Amazon sends me a confirmation email, or a request to rate a product I bought, the email ALWAYS goes to my 'sent' folder, so I never see it unless I manually look in my sent folder. Any ideas how I can fix this?

I sent an email once to my husband and he is receiving the email at the rate of around 2,500 per day.  I am getting a message saying that the email is being delayed being sent about once an hour. This is one email being sent multiple times. How can I stop it being sent?