Automatically send email reminder when a due date is close or past in excel

[dreams22]

I have an excel sheet that has the following columns, 1. document number, 2. Document Number 3. Due Date, 4. Email address of recipient.

I am looking for a VBA solution where and email is automatically generated and sent each time it is 1 day to the due date and another email sent 1 day after the due date.

Thanks for your help.