Each individual ticket has contact information associated with it and that is what is used for the notices. This is separate from the email stored in your profile. It's possible your wife's email is stored as the contact for both of your tickets (depending on how you booked them). If you bring up a reservation, go to the "Secure Flight Passenger Data & Contact Information" section. Open this and then click on the "Passenger & Emergency Contact Information (Optional)" for your individual ticket. There are fields there for your email address and contact phone number.
Thanks for the idea. I checked this and it has my email address for the contact info on both of our tickets.