In Outlook 2003, I find myself frequently sending emails to the same group of people all working on a project. I'd like to find a simple way to convert the list of addresses in an email that I would "reply all" to into an Outlook distribution list for future use.

I know how to create Outlook distribution lists, that's not my question. But the normal process that I see in Outlook requires adding the names to the list one by one. If I have an email with a large "reply all" list is there any way to take that whole list all at once (including many email addresses not otherwise already in my Outlook contacts) and convert it to a distribution list in one step?

Trying to google for this answer got me many, many pages of instructions on how to create a distribution list, but I can't seem to find the search term to locate an answer on how to convert a list of address.