How can I weed out non-openers on my email list.

Thanks for your question. I would suggest creating a segment of inactive contacts. You can do this in the Audience tab > Suggestions > Inactive Email subscribers. If you only need to remove those contacts who didn't open Email Campaign - you can create a segment with filter Not opened Email Campaign - in the last - 100 months. However, I would highly recommend to unsubscribe those contacts, but do not delete them, as they can sync back to Omnisend from the Store. If you have any unanswered questions please feel free to contact our support team 24/7 at support@omnisend.com