How can I improve my inbound/outbound email ratio?
Something that email service providers look at in determining whose traffic to monitor is inbound to outbound email ratio. If your inbound to outbound email ratio is low, this could be a reason for ESP's to begin monitoring your activity.
There's an easy way to avoid this. Simply sign up for inbound emails like newsletters and blogposts.
Here's a video tutorial on how to signup for these free email lists: