You can track sent messages, to learn what servers they move through.

1. Open the Sent folder.
2. Select the email you want to track, and then click More > Track message.
3. 
4. Select the recipient(s) to whom you sent the message that you want to track.
5. To add any additional recipients, type or select a recipient name in the Additional recipients field and click Add.
6. Select Delivery status only or Trace entire path, and click OK twice.

In your Inbox, you will receive a message with the tracking information. You can track a mail message as long as all the servers the email passes through are Domino 5 or later servers with message tracking enabled.