[Linda Buquet]

I'm not real sure and think the answer is, it depends.

I think remember some affiliates complaining about some big retailers wiping out affiliate cookies if customers bought from their newsletter. I would assume that to do that the merchant would need to be using house affiliate links and then if customers buy from a newsletter link "the house" would get credit for the sale.

A merchant could argue they were just using the affiliate link for tracking but in affect the house link would act like a 2nd affiliate link and take credit as the "last in" cookie.

I often wonder about all these IM products that are pushing optin so hard to try to build their lists. Sometimes they say we send follow up emails to help you close the sale. If they are not using affiliate links in their follow up emails (and they shouldn't be) then I don't think there's a way to negate or overwrite your cookie.

I don't really know much on this subject, just sort of sharing some thoughts.
Maybe someone else has some direct experience?