For a good set of things to check if your messages are going to spam, check out this article from ConvertKit60 that runs through several things to verify. If you continue to see issues, don't hesitate to reach out to ConvertKit's support team at help@convertkit.com73 (or with the message bubble in the lower right corner) and they can work with you as well or get you connected with their email deliverability specialists.

Aaron HockleyCommunity Guru
Photographer, Writer, Consultant