When creating your Custom Dashboards, you might want to take a look at your the number of newsletter deliveries by day. To add this component, go to Insights > New Dashboard or select a previously created Custom Dashboard > Add Component > Automated Newsletter Deliveries. For more info on creating Custom Dashboards check out this help desk article!
The Automated Newsletter Deliveries component details a graph of automated newsletter deliveries by day in the selected reporting period. Contrary to the Projected Automated Newsletter Deliveries component - this card shows your deliveries in the past rather than in the future. Also, this graph only accounts for newsletter deliveries, not dedicated email campaigns.