I can't receive an account deletion email via my Kakao Account email.

When you delete your Kakao Account, you will get an account deletion email with a list of linked "for Kakao" partner services or other services using your Kakao Account.

If you can't receive the email because you have already deleted your account, go to Delete Kakao Account > Confirm Your Kakao Account Email > Edit Email, and change your email address.
* Please note that changing your email address here does not mean your Kakao Account email will change.