# EmailMessageRelation DLO Mappings

The EmailMessageRelation object is a Salesforce standard object that you can ingest and map to Data Model Objects (DMOs) for use in Data Cloud-powered features and agents.

![Object Mapping Diagram for EmailMessageRelation](https://a.sfdcstatic.com/developer-website/sfdocs/data-cloud/media/data-cloud-dmo-mapping/standard_mappings/EmailMessageRelation_obj_mappings_v3.svg)

## Mappings to the ActivityParticipant DMO Object

The EmailMessageRelation DLO is mapped to the [ActivityParticipant DMO](/docs/data/data-cloud-dmo-mapping/guide/c360dm-si-activityparticipantdmo-dmo.md).

![Mapping diagram for EmailMessageRelation DLO to ActivityParticipant DMO](https://a.sfdcstatic.com/developer-website/sfdocs/data-cloud/media/data-cloud-dmo-mapping/standard_mappings/EmailMessageRelation_to_ActivityParticipantDmo_def_v3.svg)

- The EmailMessageRelation DLO field **RelationId** maps to the ActivityParticipant DMO Object **ParticipantId** field.
- The EmailMessageRelation DLO field **EmailMessageId** maps to the ActivityParticipant DMO Object **ActivityId** field.
- The EmailMessageRelation DLO field **ActivityObject** maps to the ActivityParticipant DMO Object **ActivityObject** field.
- The EmailMessageRelation DLO field **ParticipantObject** maps to the ActivityParticipant DMO Object **ParticipantObject** field.
- The EmailMessageRelation DLO field **DataSource** maps to the ActivityParticipant DMO Object **DataSourceId** field.
- The EmailMessageRelation DLO field **Id** maps to the ActivityParticipant DMO Object **Id** field.
- The EmailMessageRelation DLO field **ActivityParticipantRole** maps to the ActivityParticipant DMO Object **ActivityParticipantRole** field.
- The EmailMessageRelation DLO field **DataSourceObject** maps to the ActivityParticipant DMO Object **DataSourceObjectId** field.