Edit or change email of donor

Hi,

Is there a way to edit or change the email IDs of donors so we can resend receipts?

We have had a few incidences of donors mistyping their emails or wanting to change to a different one. We tried to add the new emails under Donors and deleting the old ones, but the receipts are still being sent to the original email IDs entered.

Where and how can we change the emails to new ones please?

Thank you in advance for your assistance.