Using Mailivery at a very low volume – landing in “Other”

Maybe someone can help explain what's going on because I don't understand:
I'm warming up 3 new email domains, all related to my main business. I don't send spam; these addresses will be for leads that have gone cold and newsletters, so my main inbox can focus on active clients.

During the warm-up process, I'm sending 10 emails per inbox – VERY Low. One of my emails has already had a few spam placements and "Other". I lowered the email send to 6 per day, which seems like nothing and still it's not hitting inboxes. The other two domains are and there's no discernible difference in why.

I'm a little worried the domain might become trash. Any advice? Should I pause sends?
PS. All my DNS stuff is set up correctly.