Dear Jarrett Hunt
Thanks for choosing Microsoft Community.
Based on your description, I know the scenario you met. For this, it is possible to find out how many incoming emails with attachments your company receives in Microsoft 365. You can use the Message Trace feature in the Security & Compliance Center to search for messages that contain attachments. Here are the steps:
1 Click on Search > Content search.
2 Click on the + New search button.
3 In the New search page, enter a name for the search and click on the Next button.
4 In the Locations section, select the mailbox locations you want to search (e.g., All mailboxes).
5 In the Search query section, click on the Add conditions button and select Attachment > Is present.
6 Click on the Save & run button to start the search.
The search results will show you the number of messages that contain attachments. You can also export the results to a CSV file for further analysis.
Hope this can help. If there is any update, please feel free to let me know. Your understanding and co-operation are highly appreciated.
Thanks for your precious time. Have a nice day.
Sincerely,
Katherine