Hi,
I am Nallakumar. I have more than 8 years of experience in developing automation solutions for Outlook.
I am suggesting the following solutions,
1. We will develop an Outlook plugin, that will create a button in Outlook Ribbon Home tab (File Menu for older versions of Outlook)
2. Upon clicking the button, it will extract the email address from the list of un delivered mails in the currently selected folder of Outlook and create and Excel file with the list of email ids.
This will be easier to use, as everything is done with a single click of a button.
Thanks,
Nalla