[UPHPU] Deduping a list

[Wade Preston Shearer]

> 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?

Where/how are these lists kept?

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