To change/update your e-mail id for your Bank Account, please follow the below steps.
Net Banking:
Please log in to www.icicibank.com with your User ID and Password > My Accounts > Bank Accounts > Account Statement by e-mail > Enter the required details and submit the request. The e-mail ID will be updated immediately.
click here to update your email address
ICICI Bank's iMobile app:
Log in to the ICICI Bank iMobile Pay app > Click on Smartkeys & Services > Click on Insta banking Services > Update E-mail ID > It will prompt you to log in. After logging in, > Enter the new e-mail ID and submit.
Please click here to navigate.