diff --git a/tests/orchestration/test_scenario_export_orchestrator.py b/tests/orchestration/test_scenario_export_orchestrator.py
index fc918d0e8..17e933f81 100644
--- a/tests/orchestration/test_scenario_export_orchestrator.py
+++ b/tests/orchestration/test_scenario_export_orchestrator.py
@@ -93,3 +93,65 @@ def test_builds_and_uploads_a_sheet_per_scenario_workbook(exports: S3Client) ->
     assert result.export_s3_key in result.presigned_url
     workbook = load_workbook(BytesIO(exports.get_object(result.export_s3_key)))
     assert workbook.sheetnames == ["Fabric first", "Low carbon"]
+
+
+def test_emails_the_requester_the_presigned_download_link(exports: S3Client) -> None:
+    # arrange
+    email = _RecordingEmail()
+    orchestrator = ScenarioExportOrchestrator(
+        rows=_FakeRows({5: [_row(1)]}),
+        scenarios=_FakeScenarioNames({5: "Fabric first"}),
+        exports=exports,
+        email=email,
+        url_ttl_seconds=3600,
+    )
+
+    # act
+    result = orchestrator.run(
+        portfolio_id=100,
+        scenario_ids=[5],
+        property_ids=[1],
+        recipient_email="user@example.com",
+        export_name="portfolio-100",
+    )
+
+    # assert — the requester is emailed the link (raw URL in the plain-text
+    # fallback, a clean button in the HTML alternative).
+    assert len(email.sent) == 1
+    to, _subject, body, html_body = email.sent[0]
+    assert to == "user@example.com"
+    assert result.presigned_url in body
+    assert html_body is not None
+    assert "Download" in html_body
+
+
+class _FailingEmail:
+    def send(
+        self, *, to: str, subject: str, body: str, html_body: Optional[str] = None
+    ) -> None:
+        raise RuntimeError("smtp down")
+
+
+def test_an_email_failure_does_not_lose_the_built_export(exports: S3Client) -> None:
+    # arrange — the workbook uploads fine, but email delivery blows up.
+    orchestrator = ScenarioExportOrchestrator(
+        rows=_FakeRows({5: [_row(1)]}),
+        scenarios=_FakeScenarioNames({5: "Fabric first"}),
+        exports=exports,
+        email=_FailingEmail(),
+        url_ttl_seconds=3600,
+    )
+
+    # act — must not raise.
+    result = orchestrator.run(
+        portfolio_id=100,
+        scenario_ids=[5],
+        property_ids=[1],
+        recipient_email="user@example.com",
+        export_name="portfolio-100",
+    )
+
+    # assert — the export was still uploaded and its link returned (it also lands
+    # on sub_task.outputs, so the link isn't lost).
+    assert result.presigned_url
+    assert exports.get_object(result.export_s3_key)