Ever wonder why your emails suddenly hit the spam folder? It usually comes down...

https://www.tumblr.com/weepingmountainzealot/811775027481542656/what-does-dwell-time-mean-for-email-engagement

Ever wonder why your emails suddenly hit the spam folder? It usually comes down to your domain reputation. If you don't keep your spam complaint rate below 0.1%—that is just one complaint per 1,000 emails—mailbox providers will start filtering you out