Struggling to hit the inbox? It usually comes down to your domain reputation....

https://www.jelly-bookmarks.win/ever-wonder-why-your-emails-vanish-into-the-void-of-the-spam-folder-it-usually

Struggling to hit the inbox? It usually comes down to your domain reputation. If your spam complaint rate creeps above 0.1%—that is just one complaint for every 1,000 emails—mailbox providers will start filtering you out