You can also use Get-MessageTrackingLog command to check the latest email that sent to group and received from group:
The latest email that sent to group:
Get-TransportService | Get-MessageTrackingLog -Recipients ******@domain.com -EventId RECEIVE -Source SMTP | Sort-Object Timestamp -Descending | select Timestamp,Sender,MessageSubject -First 1
The latest email that receive from group:
Get-TransportService | Get-MessageTrackingLog -Sender ******@domain.com -EventId send -Source SMTP | Sort-Object Timestamp -Descending | select Timestamp,Sender,MessageSubject -First 1
Please note that the Message Tracking log can only record logs within 30 days:
Get-TransportService | fl MessageTrackingLogMaxAge
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