Create an Exact Data Match (EDM) with the information you want to use for a Directory Group Match (DGM). Note: When creating the EDM you must take the extra step of mapping system fields.
AOL IM Name
Yahoo IM Name
MSN IM Name
You can map more than one, but you must have one for this profile to be used in "Sender/User xxx Match".
Click on "Finished".
Verify you get a green banner with "A new registered content <name> was successfully saved."
When you create a policy or add a new rule, on the "Generate Incidents when:" page, in the section "Identity", the drop down list for "Sender/User Matches Directory From" will have the <name> in the list.
If the field mappings are not done, the EDM will not show up in the "Sender/User Matches Directory From" drop down list.