Here is a sample template you can use to write a change in email ID letter to your bank.
To Branch Manager [name],
I [name], hold an account in your branch, with the account number [number]. I would like to notify you that my account does not have an email address. As such, I am unable to receive transactional and bank-related emails.
My email address is [ID]. It is hereby requested to kindly update the aforementioned address to my account number.
Attached is a document confirming the A/C number and IFSC code of your bank branch. Any other documents required in this case shall be e sufficed within the given time.
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