Hello there, kburkes...
I have been reviewing older question here in the Canvas Community, and I stumbled upon your question. While I don't really have a solution for you myself, I wanted to check in with you to see if you've had any luck in finding a solution to messaging students who have not logged in on your own. It looks like @dhulsey gave you a work-around solution, but you don't necessarily want it tied to a graded assignment in the Gradebook. If you've been able to find a different solution on your own, would you be able to share that back here in the Community with us? Or, if you are still looking for some help with this, please let us know that as well so that someone might be able to assist you. For now, I am going to mark your question as "Assumed Answered" because there hasn't bbeen any new activity in this topic since March 14, 2018. However, that won't prevent you or others from posting additional questions and/or comments below that are related to this topic. I hope that's alright with you, Kate. Looking forward to hearing back from you soon.
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