From f45c3efcb928169d3d59b50d6beac4424a89f27a Mon Sep 17 00:00:00 2001
From: Manu <tr4nt0r@uber.space>
Date: Fri, 2 Oct 2026 23:20:33 +0200
Subject: [PATCH] Add diagnostics platform to SMTP (#184091)

---
 homeassistant/components/smtp/diagnostics.py  | 38 +++++++++++++++++++
 .../smtp/snapshots/test_diagnostics.ambr      | 21 ++++++++++
 tests/components/smtp/test_diagnostics.py     | 28 ++++++++++++++
 3 files changed, 87 insertions(+)
 create mode 100644 homeassistant/components/smtp/diagnostics.py
 create mode 100644 tests/components/smtp/snapshots/test_diagnostics.ambr
 create mode 100644 tests/components/smtp/test_diagnostics.py

diff --git a/homeassistant/components/smtp/diagnostics.py b/homeassistant/components/smtp/diagnostics.py
new file mode 100644
index 000000000000..db119e220691
--- /dev/null
+++ b/homeassistant/components/smtp/diagnostics.py
@@ -0,0 +1,38 @@
+"""Diagnostics platform for SMTP integration."""
+
+from typing import Any
+
+from homeassistant.components.diagnostics import async_redact_data
+from homeassistant.const import (
+    CONF_PASSWORD,
+    CONF_RECIPIENT,
+    CONF_SENDER,
+    CONF_USERNAME,
+)
+from homeassistant.core import HomeAssistant
+
+from . import SmtpConfigEntry
+from .const import CONF_REPLY_TO, CONF_REPLY_TO_NAME, CONF_SENDER_NAME, CONF_SERVER
+
+TO_REDACT = {
+    CONF_PASSWORD,
+    CONF_USERNAME,
+    CONF_SENDER,
+    CONF_SENDER_NAME,
+    CONF_REPLY_TO,
+    CONF_REPLY_TO_NAME,
+    CONF_SERVER,
+    CONF_RECIPIENT,
+}
+
+
+async def async_get_config_entry_diagnostics(
+    hass: HomeAssistant, config_entry: SmtpConfigEntry
+) -> dict[str, Any]:
+    """Return diagnostics for a config entry."""
+
+    return {
+        "data": async_redact_data(data=config_entry.data, to_redact=TO_REDACT),
+        "options": async_redact_data(data=config_entry.options, to_redact=TO_REDACT),
+        "subentries": len(config_entry.subentries),
+    }
diff --git a/tests/components/smtp/snapshots/test_diagnostics.ambr b/tests/components/smtp/snapshots/test_diagnostics.ambr
new file mode 100644
index 000000000000..866fd8343358
--- /dev/null
+++ b/tests/components/smtp/snapshots/test_diagnostics.ambr
@@ -0,0 +1,21 @@
+# serializer version: 1
+# name: test_diagnostics
+  dict({
+    'data': dict({
+      'encryption': 'starttls',
+      'password': '**REDACTED**',
+      'port': 587,
+      'sender': '**REDACTED**',
+      'sender_name': '**REDACTED**',
+      'server': '**REDACTED**',
+      'username': '**REDACTED**',
+      'verify_ssl': True,
+    }),
+    'options': dict({
+      'reply_to': '**REDACTED**',
+      'reply_to_name': '**REDACTED**',
+      'timeout': 1312,
+    }),
+    'subentries': 1,
+  })
+# ---
diff --git a/tests/components/smtp/test_diagnostics.py b/tests/components/smtp/test_diagnostics.py
new file mode 100644
index 000000000000..79128e588082
--- /dev/null
+++ b/tests/components/smtp/test_diagnostics.py
@@ -0,0 +1,28 @@
+"""Tests for SMTP diagnostics."""
+
+import pytest
+from syrupy.assertion import SnapshotAssertion
+
+from homeassistant.core import HomeAssistant
+
+from tests.common import MockConfigEntry
+from tests.components.diagnostics import get_diagnostics_for_config_entry
+from tests.typing import ClientSessionGenerator
+
+
+@pytest.mark.usefixtures("smtp", "aiosmtplib")
+async def test_diagnostics(
+    hass: HomeAssistant,
+    hass_client: ClientSessionGenerator,
+    config_entry: MockConfigEntry,
+    snapshot: SnapshotAssertion,
+) -> None:
+    """Test diagnostics."""
+
+    config_entry.add_to_hass(hass)
+    await hass.config_entries.async_setup(config_entry.entry_id)
+    await hass.async_block_till_done()
+    assert (
+        await get_diagnostics_for_config_entry(hass, hass_client, config_entry)
+        == snapshot
+    )