Is your email missing the inbox? It usually comes down to your domain...

https://www.last-bookmarks.win/ever-wonder-why-your-emails-vanish-into-the-void-it-usually-comes-down-to-your

Is your email missing the inbox? It usually comes down to your domain reputation. If your spam complaint rate stays above 0.1%—that is one complaint per 1,000 emails—mailbox providers will start filtering you out automatically