sent email tracking

[BobD857]

Each month I receive a large Excel file that needs massaging. After I trim it down to just the email addresses I send an email to everyone on the list. The next month I get a new file, which may contain different contact email addresses. Is there some way I can create a report of who I've sent emails to each month to compare them and possibly not send duplicate emails to?

[Caitlin_M]

Hello @BobD857. You can create a segment that pulls in contacts sent any email within a time frame. Once the segment is created, you can export the contacts.