diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4cf9be8..501c76e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,23 @@
 # Changelog
 
+## 9.4.0
+
+### Added
+
+- Extracted `load_reverse_dns_map()` utility function in `utils.py` for loading the reverse DNS map independently of individual IP lookups.
+- SIGHUP reload now re-downloads/reloads the reverse DNS map, so changes take effect without restarting.
+- Add premade OpenSearch index patterns, visualizations, and dashboards
+
+### Changed
+
+- When `index_prefix_domain_map` is configured, SMTP TLS reports for domains not in the map are now silently dropped instead of being output. Unlike DMARC, TLS-RPT has no DNS authorization records, so this filtering prevents processing reports for unrelated domains.
+- Bump OpenSearch support to `< 4`
+
+### Fixed
+
+- Fixed `get_index_prefix` using wrong key (`domain` instead of `policy_domain`) for SMTP TLS reports, which prevented domain map matching from working for TLS reports.
+- Domain matching in `get_index_prefix` now lowercases the domain for case-insensitive comparison.
+
 ## 9.3.1
 
 ### Breaking changes
diff --git a/docker-compose.dashboard-dev.yml b/docker-compose.dashboard-dev.yml
index 5dccc34..583cd89 100644
--- a/docker-compose.dashboard-dev.yml
+++ b/docker-compose.dashboard-dev.yml
@@ -15,7 +15,7 @@ services:
         condition: service_healthy
 
   opensearch-dashboards:
-    image: opensearchproject/opensearch-dashboards:2
+    image: opensearchproject/opensearch-dashboards:3
     environment:
       - OPENSEARCH_HOSTS=["https://opensearch:9200"]
     ports:
diff --git a/opensearch/opensearch_dashboards.ndjson b/opensearch/opensearch_dashboards.ndjson
new file mode 100644
index 0000000..e069126
--- /dev/null
+++ b/opensearch/opensearch_dashboards.ndjson
@@ -0,0 +1,28 @@
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+{"exportedCount":27,"missingRefCount":0,"missingReferences":[]}
\ No newline at end of file
diff --git a/parsedmarc/cli.py b/parsedmarc/cli.py
index 6e1beed..8993f6d 100644
--- a/parsedmarc/cli.py
+++ b/parsedmarc/cli.py
@@ -19,6 +19,7 @@ import yaml
 from tqdm import tqdm
 
 from parsedmarc import (
+    REVERSE_DNS_MAP,
     SEEN_AGGREGATE_REPORT_IDS,
     InvalidDMARCReport,
     ParserError,
@@ -48,7 +49,12 @@ from parsedmarc.mail import (
 )
 from parsedmarc.mail.graph import AuthMethod
 from parsedmarc.types import ParsingResults
-from parsedmarc.utils import get_base_domain, get_reverse_dns, is_mbox
+from parsedmarc.utils import (
+    get_base_domain,
+    get_reverse_dns,
+    is_mbox,
+    load_reverse_dns_map,
+)
 
 # Increase the max header limit for very large emails. `_MAXHEADERS` is a
 # private stdlib attribute and may not exist in type stubs.
@@ -1068,20 +1074,22 @@ def _main():
         elif "reported_domain" in report:
             domain = report["reported_domain"]
         elif "policies" in report:
-            domain = report["policies"][0]["domain"]
+            domain = report["policies"][0]["policy_domain"]
         if domain:
             domain = get_base_domain(domain)
-            for prefix in index_prefix_domain_map:
-                if domain in index_prefix_domain_map[prefix]:
-                    prefix = (
-                        prefix.lower()
-                        .strip()
-                        .strip("_")
-                        .replace(" ", "_")
-                        .replace("-", "_")
-                    )
-                    prefix = f"{prefix}_"
-                    return prefix
+            if domain:
+                domain = domain.lower()
+                for prefix in index_prefix_domain_map:
+                    if domain in index_prefix_domain_map[prefix]:
+                        prefix = (
+                            prefix.lower()
+                            .strip()
+                            .strip("_")
+                            .replace(" ", "_")
+                            .replace("-", "_")
+                        )
+                        prefix = f"{prefix}_"
+                        return prefix
         return None
 
     def process_reports(reports_):
@@ -1092,6 +1100,22 @@ def _main():
             logger.error(message)
             output_errors.append(message)
 
+        if index_prefix_domain_map is not None:
+            filtered_tls = []
+            for report in reports_.get("smtp_tls_reports", []):
+                if get_index_prefix(report) is not None:
+                    filtered_tls.append(report)
+                else:
+                    domain = "unknown"
+                    if "policies" in report and report["policies"]:
+                        domain = report["policies"][0].get("policy_domain", "unknown")
+                    logger.debug(
+                        "Ignoring SMTP TLS report for domain not in "
+                        "index_prefix_domain_map: %s",
+                        domain,
+                    )
+            reports_["smtp_tls_reports"] = filtered_tls
+
         indent_value = 2 if opts.prettify_json else None
         output_str = "{0}\n".format(
             json.dumps(reports_, ensure_ascii=False, indent=indent_value)
@@ -2087,6 +2111,17 @@ def _main():
                 _close_output_clients(clients)
                 clients = new_clients
                 index_prefix_domain_map = new_index_prefix_domain_map
+
+                # Reload the reverse DNS map so changes to the
+                # map path/URL in the config take effect.
+                load_reverse_dns_map(
+                    REVERSE_DNS_MAP,
+                    always_use_local_file=new_opts.always_use_local_files,
+                    local_file_path=new_opts.reverse_dns_map_path,
+                    url=new_opts.reverse_dns_map_url,
+                    offline=new_opts.offline,
+                )
+
                 for k, v in vars(new_opts).items():
                     setattr(opts, k, v)
 
diff --git a/parsedmarc/constants.py b/parsedmarc/constants.py
index 823c2f9..3e948ad 100644
--- a/parsedmarc/constants.py
+++ b/parsedmarc/constants.py
@@ -1,3 +1,3 @@
-__version__ = "9.3.1"
+__version__ = "9.4.0"
 
 USER_AGENT = f"parsedmarc/{__version__}"
diff --git a/parsedmarc/utils.py b/parsedmarc/utils.py
index 965c9bb..e763a71 100644
--- a/parsedmarc/utils.py
+++ b/parsedmarc/utils.py
@@ -335,6 +335,76 @@ def get_ip_address_country(
     return country
 
 
+def load_reverse_dns_map(
+    reverse_dns_map: ReverseDNSMap,
+    *,
+    always_use_local_file: bool = False,
+    local_file_path: Optional[str] = None,
+    url: Optional[str] = None,
+    offline: bool = False,
+) -> None:
+    """
+    Loads the reverse DNS map from a URL or local file.
+
+    Clears and repopulates the given map dict in place. If the map is
+    fetched from a URL, that is tried first; on failure (or if offline/local
+    mode is selected) the bundled CSV is used as a fallback.
+
+    Args:
+        reverse_dns_map (dict): The map dict to populate (modified in place)
+        always_use_local_file (bool): Always use a local map file
+        local_file_path (str): Path to a local map file
+        url (str): URL to a reverse DNS map
+        offline (bool): Use the built-in copy of the reverse DNS map
+    """
+    if url is None:
+        url = (
+            "https://raw.githubusercontent.com/domainaware"
+            "/parsedmarc/master/parsedmarc/"
+            "resources/maps/base_reverse_dns_map.csv"
+        )
+
+    reverse_dns_map.clear()
+
+    def load_csv(_csv_file):
+        reader = csv.DictReader(_csv_file)
+        for row in reader:
+            key = row["base_reverse_dns"].lower().strip()
+            reverse_dns_map[key] = {
+                "name": row["name"].strip(),
+                "type": row["type"].strip(),
+            }
+
+    csv_file = io.StringIO()
+
+    if not (offline or always_use_local_file):
+        try:
+            logger.debug(f"Trying to fetch reverse DNS map from {url}...")
+            headers = {"User-Agent": USER_AGENT}
+            response = requests.get(url, headers=headers)
+            response.raise_for_status()
+            csv_file.write(response.text)
+            csv_file.seek(0)
+            load_csv(csv_file)
+        except requests.exceptions.RequestException as e:
+            logger.warning(f"Failed to fetch reverse DNS map: {e}")
+        except Exception:
+            logger.warning("Not a valid CSV file")
+            csv_file.seek(0)
+            logging.debug("Response body:")
+            logger.debug(csv_file.read())
+
+    if len(reverse_dns_map) == 0:
+        logger.info("Loading included reverse DNS map...")
+        path = str(
+            files(parsedmarc.resources.maps).joinpath("base_reverse_dns_map.csv")
+        )
+        if local_file_path is not None:
+            path = local_file_path
+        with open(path) as csv_file:
+            load_csv(csv_file)
+
+
 def get_service_from_reverse_dns_base_domain(
     base_domain,
     *,
@@ -361,55 +431,21 @@ def get_service_from_reverse_dns_base_domain(
     """
 
     base_domain = base_domain.lower().strip()
-    if url is None:
-        url = (
-            "https://raw.githubusercontent.com/domainaware"
-            "/parsedmarc/master/parsedmarc/"
-            "resources/maps/base_reverse_dns_map.csv"
-        )
     reverse_dns_map_value: ReverseDNSMap
     if reverse_dns_map is None:
         reverse_dns_map_value = {}
     else:
         reverse_dns_map_value = reverse_dns_map
 
-    def load_csv(_csv_file):
-        reader = csv.DictReader(_csv_file)
-        for row in reader:
-            key = row["base_reverse_dns"].lower().strip()
-            reverse_dns_map_value[key] = {
-                "name": row["name"],
-                "type": row["type"],
-            }
-
-    csv_file = io.StringIO()
-
-    if not (offline or always_use_local_file) and len(reverse_dns_map_value) == 0:
-        try:
-            logger.debug(f"Trying to fetch reverse DNS map from {url}...")
-            headers = {"User-Agent": USER_AGENT}
-            response = requests.get(url, headers=headers)
-            response.raise_for_status()
-            csv_file.write(response.text)
-            csv_file.seek(0)
-            load_csv(csv_file)
-        except requests.exceptions.RequestException as e:
-            logger.warning(f"Failed to fetch reverse DNS map: {e}")
-        except Exception:
-            logger.warning("Not a valid CSV file")
-            csv_file.seek(0)
-            logging.debug("Response body:")
-            logger.debug(csv_file.read())
-
     if len(reverse_dns_map_value) == 0:
-        logger.info("Loading included reverse DNS map...")
-        path = str(
-            files(parsedmarc.resources.maps).joinpath("base_reverse_dns_map.csv")
+        load_reverse_dns_map(
+            reverse_dns_map_value,
+            always_use_local_file=always_use_local_file,
+            local_file_path=local_file_path,
+            url=url,
+            offline=offline,
         )
-        if local_file_path is not None:
-            path = local_file_path
-        with open(path) as csv_file:
-            load_csv(csv_file)
+
     service: ReverseDNSService
     try:
         service = reverse_dns_map_value[base_domain]
diff --git a/pyproject.toml b/pyproject.toml
index 056a312..a33018c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -50,7 +50,7 @@ dependencies = [
     "lxml>=4.4.0",
     "mailsuite>=1.11.2",
     "msgraph-core==0.2.2",
-    "opensearch-py>=2.4.2,<=3.0.0",
+    "opensearch-py>=2.4.2,<=4.0.0",
     "publicsuffixlist>=0.10.0",
     "pygelf>=0.4.2",
     "requests>=2.22.0",
diff --git a/tests.py b/tests.py
index 538079a..60d9946 100755
--- a/tests.py
+++ b/tests.py
@@ -4,6 +4,7 @@
 from __future__ import absolute_import, print_function, unicode_literals
 
 import io
+import json
 import os
 import signal
 import sys
@@ -2278,6 +2279,200 @@ watch = true
         # Second init (after reload with v2 config): kafka_hosts should be None
         self.assertIsNone(init_opts_captures[1].kafka_hosts)
 
+    @unittest.skipUnless(
+        hasattr(signal, "SIGHUP"),
+        "SIGHUP not available on this platform",
+    )
+    @patch("parsedmarc.cli._init_output_clients")
+    @patch("parsedmarc.cli._parse_config_file")
+    @patch("parsedmarc.cli.get_dmarc_reports_from_mailbox")
+    @patch("parsedmarc.cli.watch_inbox")
+    @patch("parsedmarc.cli.IMAPConnection")
+    def testReloadRefreshesReverseDnsMap(
+        self,
+        mock_imap,
+        mock_watch,
+        mock_get_reports,
+        mock_parse_config,
+        mock_init_clients,
+    ):
+        """SIGHUP reload repopulates the reverse DNS map so lookups still work."""
+        import signal as signal_module
+
+        from parsedmarc import REVERSE_DNS_MAP
+
+        mock_imap.return_value = object()
+        mock_get_reports.return_value = {
+            "aggregate_reports": [],
+            "forensic_reports": [],
+            "smtp_tls_reports": [],
+        }
+
+        def parse_side_effect(config_file, opts):
+            opts.imap_host = "imap.example.com"
+            opts.imap_user = "user"
+            opts.imap_password = "pass"
+            opts.mailbox_watch = True
+            return None
+
+        mock_parse_config.side_effect = parse_side_effect
+        mock_init_clients.return_value = {}
+
+        # Snapshot the map state after each watch_inbox call
+        map_snapshots = []
+
+        watch_calls = [0]
+
+        def watch_side_effect(*args, **kwargs):
+            watch_calls[0] += 1
+            if watch_calls[0] == 1:
+                if hasattr(signal_module, "SIGHUP"):
+                    import os
+
+                    os.kill(os.getpid(), signal_module.SIGHUP)
+                return
+            else:
+                # Capture the map state after reload, before we stop the loop
+                map_snapshots.append(dict(REVERSE_DNS_MAP))
+                raise FileExistsError("stop")
+
+        mock_watch.side_effect = watch_side_effect
+
+        with tempfile.NamedTemporaryFile("w", suffix=".ini", delete=False) as cfg:
+            cfg.write(self._BASE_CONFIG)
+            cfg_path = cfg.name
+        self.addCleanup(lambda: os.path.exists(cfg_path) and os.remove(cfg_path))
+
+        # Pre-populate the map so we can verify it gets refreshed
+        REVERSE_DNS_MAP.clear()
+        REVERSE_DNS_MAP["stale.example.com"] = {
+            "name": "Stale",
+            "type": "stale",
+        }
+        original_contents = dict(REVERSE_DNS_MAP)
+
+        with patch.object(sys, "argv", ["parsedmarc", "-c", cfg_path]):
+            with self.assertRaises(SystemExit):
+                parsedmarc.cli._main()
+
+        self.assertEqual(mock_watch.call_count, 2)
+        # The map should have been repopulated (not empty, not the stale data)
+        self.assertEqual(len(map_snapshots), 1)
+        refreshed = map_snapshots[0]
+        self.assertGreater(len(refreshed), 0, "Map should not be empty after reload")
+        self.assertNotEqual(
+            refreshed,
+            original_contents,
+            "Map should have been refreshed, not kept stale data",
+        )
+        self.assertNotIn(
+            "stale.example.com",
+            refreshed,
+            "Stale entry should have been cleared by reload",
+        )
+
+
+class TestIndexPrefixDomainMapTlsFiltering(unittest.TestCase):
+    """Tests that SMTP TLS reports for unmapped domains are filtered out
+    when index_prefix_domain_map is configured."""
+
+    @patch("parsedmarc.cli.get_dmarc_reports_from_mailbox")
+    @patch("parsedmarc.cli.IMAPConnection")
+    def testTlsReportsFilteredByDomainMap(
+        self,
+        mock_imap_connection,
+        mock_get_reports,
+    ):
+        """TLS reports for domains not in the map should be silently dropped."""
+        mock_imap_connection.return_value = object()
+        mock_get_reports.return_value = {
+            "aggregate_reports": [],
+            "forensic_reports": [],
+            "smtp_tls_reports": [
+                {
+                    "organization_name": "Allowed Org",
+                    "begin_date": "2024-01-01T00:00:00Z",
+                    "end_date": "2024-01-01T23:59:59Z",
+                    "report_id": "allowed-1",
+                    "contact_info": "tls@allowed.example.com",
+                    "policies": [
+                        {
+                            "policy_domain": "allowed.example.com",
+                            "policy_type": "sts",
+                            "successful_session_count": 1,
+                            "failed_session_count": 0,
+                        }
+                    ],
+                },
+                {
+                    "organization_name": "Unmapped Org",
+                    "begin_date": "2024-01-01T00:00:00Z",
+                    "end_date": "2024-01-01T23:59:59Z",
+                    "report_id": "unmapped-1",
+                    "contact_info": "tls@unmapped.example.net",
+                    "policies": [
+                        {
+                            "policy_domain": "unmapped.example.net",
+                            "policy_type": "sts",
+                            "successful_session_count": 5,
+                            "failed_session_count": 0,
+                        }
+                    ],
+                },
+                {
+                    "organization_name": "Mixed Case Org",
+                    "begin_date": "2024-01-01T00:00:00Z",
+                    "end_date": "2024-01-01T23:59:59Z",
+                    "report_id": "mixed-case-1",
+                    "contact_info": "tls@mixedcase.example.com",
+                    "policies": [
+                        {
+                            "policy_domain": "MixedCase.Example.Com",
+                            "policy_type": "sts",
+                            "successful_session_count": 2,
+                            "failed_session_count": 0,
+                        }
+                    ],
+                },
+            ],
+        }
+
+        domain_map = {"tenant_a": ["example.com"]}
+        with NamedTemporaryFile("w", suffix=".yaml", delete=False) as map_file:
+            import yaml
+
+            yaml.dump(domain_map, map_file)
+            map_path = map_file.name
+        self.addCleanup(lambda: os.path.exists(map_path) and os.remove(map_path))
+
+        config = f"""[general]
+save_smtp_tls = true
+silent = false
+index_prefix_domain_map = {map_path}
+
+[imap]
+host = imap.example.com
+user = test-user
+password = test-password
+"""
+        with NamedTemporaryFile("w", suffix=".ini", delete=False) as config_file:
+            config_file.write(config)
+            config_path = config_file.name
+        self.addCleanup(lambda: os.path.exists(config_path) and os.remove(config_path))
+
+        captured = io.StringIO()
+        with patch.object(sys, "argv", ["parsedmarc", "-c", config_path]):
+            with patch("sys.stdout", captured):
+                parsedmarc.cli._main()
+
+        output = json.loads(captured.getvalue())
+        tls_reports = output["smtp_tls_reports"]
+        self.assertEqual(len(tls_reports), 2)
+        report_ids = {r["report_id"] for r in tls_reports}
+        self.assertIn("allowed-1", report_ids)
+        self.assertIn("mixed-case-1", report_ids)
+        self.assertNotIn("unmapped-1", report_ids)
+
 
 if __name__ == "__main__":
     unittest.main(verbosity=2)