Hi,
Thanks for the beers! Much appreciated.
If you are importing them you should do whatever is needed to mark those as verified in the database upon import. Our import utility is only example code that was designed for a specific data format so if it is not working correctly with your data you may need to modify it.
Normally the way it works is you put a Newsletter Sign Up module on a page. If a non-authenticated user signs ups then we have to mark it as not verified. We send them a confirmation email to verify that they signed up, if they click the link the subscription is now verified. This is needed because there are lots of bots crawling the internet scraping emails and posting them into forms, so we cannot be sure if it is a legitimate person signing up for the newsletter without verification. For site members who are signed into the site we can assume they are legit since we typically have something to verify site registration either using a captcha or a confirmation email.
When importing data you must make your own decision whether to mark them as verified based on where the data came from.
These things help you stay in compliance with the CANSPAM laws and help protect your reputation as an email sender.
Hope that helps,
Joe