Opened any email in last 1 year - filter for email sends
We use a filter on our email sends for "opened any email in the last 1 year" to help with deliverability. However, I've noticed our email send list has drastically lessened since I started over the last 2 years - wondering if anyone else uses this filter for deliverability purposes or is there harm in removing for the next email send just to test how that goes OR would having a lower deliverability rate greatly impact us? Thanks!