[UPHPU] Deduping a list

[Wayne Jensen]

On 7/26/06, Ash <ashovi at qwest.net> wrote:
> I have a list of email addresses and a list of those who have
> unsubscribed. (We get a new list to send to every time from our partner,
> but we have to keep track of those who have unsubscribed from getting
> our emails, and remove them from the new list every time.)
>
> So I have list 1 that has 10,000 email addresses in it and a list of
> unsubscribes that has about 200 email addresses. I want to remove all
> unsubscribes from the main list. Is there an easy way to do it?
>
> Ash
>

What format are the lists in?  Is there a database involved?