Possible to note a newsletter subscriber in Orders?

yoishoshop
Tourist
6 0 3

When going through your orders, is there a way to tell when a purchase is made from a newsletter subscriber? 

I'm trying to give anyone who subscribes to my newsletter a little extra when they make their purchase and I haven't figured out a good way to identify them from their orders aside from cross-referencing the master list of email subscribers.

Thank you!

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