There are a few ways to see all the sent emails for the last month. This can be helpful for organizations that split email marketing between departments.
Export Campaign Metrics
Go to Reporting > Export Data to export Campaign Metrics to see Campaign name, Subscriber list total, and top level stats for the email.
Compare Campaigns for last month
Go to Reporting > Compare Campaigns to run a comparison report. Select Campaign type ‘Standard’, skip selecting a Label, and toggle Sent within to ‘past month’. Then select Show Results.
View Sent Campaigns for past month
Go to Reporting > Sent Campaigns. Toggle the Date dropdown to ‘Past Month’.