Find external messaging participants in a Yammer network
When you communicate with outside partners, suppliers, or customers, you want to make sure only authorized personnel have access to the information on your Yammer network. Verified admins can use data export to find the names of external participants to see which conversations and files in their network are visible to external participants.
Yammer Enterprise networks in the EU Geo do not have external participants.
In the Yammer admin center, go to Content and Security > Export data.
You'll only see this option if you are a verified admin in the Yammer network.
For more information, see Export Yammer Enterprise data.
To identify threads in your network that users from other networks participate in, locate the export folder on your computer, and open the MessageThreads.Outbound.csv export file.
The data export reflects the current view of the network. For example, if a user was added, but then removed before the report was created, that user won't appear in the report.
Column D (external_participants) lists the users in other networks that participate in threads in your network, along with their name, email address, and the network ID of the Yammer network they belong to.
If you want to remove an external participant, you can use the information from the list to go to the conversation they're included in and remove them from the conversation. See Remove an external participant from a conversation.
Add external participants to your Yammer conversations
External Yammer participants FAQ