>pull all emails from a certain time frame that are to/from six of our staff and are from anyone at a certain domain
When create the eDiscovery search request, you could enter the ”domain name“ into the from or to list directly. You don't need to click "add users" and choose from the given list.
You need to create two eDiscovery search requests, one for From domain.com, another for To domain.com
If you are familiar with PowerShell, you can also use Search-Mailbox command to do this job, it could export the result to a specific mailbox:
For more detailed information, have a look about those articles:
If the response is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.