def _add_email_header_artifacts(self, email_header_artifacts, start_index, artifacts):
    added_artifacts = 0
    for artifact in email_header_artifacts:
        artifact['source_data_identifier'] = (start_index + added_artifacts)
        artifacts.append(artifact)
        added_artifacts += 1
    return added_artifacts
def _add_email_header_artifacts(self, email_header_artifacts, start_index, artifacts):
    added_artifacts = 0
    for artifact in email_header_artifacts:
        artifact['source_data_identifier'] = (start_index + added_artifacts)
        artifacts.append(artifact)
        added_artifacts += 1
    return added_artifacts