Yes, you can send to one group or the other, or both. If by 'all' you mean all folks subscribing, the answer is 'yes'.
The email exporter allows you to select the audience you wish to export. So you can do all of the above, select newsletter-only subscriber, account-only or both together. (note: it's been a while since I've actively used this, but a quick check of the file seems to confirm this. ymmv).
-Ng_
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