diff --git a/backend/app/services/daily_report_format.py b/backend/app/services/daily_report_format.py
index 37b3928..72d23a1 100644
--- a/backend/app/services/daily_report_format.py
+++ b/backend/app/services/daily_report_format.py
@@ -17,8 +17,92 @@ SSH_BAN_TYPES = frozenset({"ssh.ip.banned"})
 _SERVER_LINE_RE = re.compile(r"(?m)^🖥️\s*Сервер\s*:")
 _ACTIVE_USERS_HEADER_RE = re.compile(r"^👥\s*АКТИВНЫЕ ПОЛЬЗОВАТЕЛИ")
 _AGENT_VERSION_LINE_RE = re.compile(r"(?m)^Agent version\s+", re.IGNORECASE)
+_NOTIFICATION_SOURCE_RE = re.compile(r"(?m)^📡\s*Оповещение:\s*")
+_LEGACY_SAC_SOURCE_RE = re.compile(
+    r"(?m)^Источник:\s*Security Alert Center\b.*$",
+    re.IGNORECASE,
+)
 _DAILY_REPORT_TITLE_MARKER = "ЕЖЕДНЕВНЫЙ ОТЧЕТ"
 _SECTION_HEADER_RE = re.compile(r"^[📈🧾👥🖥️🕐]")
+NOTIFICATION_SOURCE_PREFIX = "📡 Оповещение:"
+
+
+def format_notification_source_plain(
+    *,
+    generated_by: str,
+    product: str | None = None,
+    product_version: str | None = None,
+) -> str:
+    gb = (generated_by or "agent").strip().lower()
+    if gb == "sac":
+        return f"{NOTIFICATION_SOURCE_PREFIX} SAC (Security Alert Center)"
+    label = (product or "агент").strip()
+    version = (product_version or "").strip()
+    if version:
+        return f"{NOTIFICATION_SOURCE_PREFIX} агент ({label} {version})"
+    return f"{NOTIFICATION_SOURCE_PREFIX} агент ({label})"
+
+
+def has_notification_source_line(text: str) -> bool:
+    return bool(_NOTIFICATION_SOURCE_RE.search(text or ""))
+
+
+def strip_legacy_sac_source_line(text: str) -> str:
+    return _LEGACY_SAC_SOURCE_RE.sub("", text or "").strip()
+
+
+def append_notification_source_plain(
+    body: str,
+    *,
+    generated_by: str,
+    product: str | None = None,
+    product_version: str | None = None,
+) -> str:
+    text = strip_legacy_sac_source_line(body or "")
+    if has_notification_source_line(text):
+        return text
+    line = format_notification_source_plain(
+        generated_by=generated_by,
+        product=product,
+        product_version=product_version,
+    )
+    if text:
+        return f"{text.rstrip()}\n\n{line}"
+    return line
+
+
+def append_notification_source_html(
+    html_msg: str,
+    *,
+    generated_by: str,
+    product: str | None = None,
+    product_version: str | None = None,
+) -> str:
+    plain_line = format_notification_source_plain(
+        generated_by=generated_by,
+        product=product,
+        product_version=product_version,
+    )
+    if NOTIFICATION_SOURCE_PREFIX in (html_msg or ""):
+        return (html_msg or "").rstrip()
+    line = html.escape(plain_line)
+    msg = (html_msg or "").rstrip()
+    if msg:
+        return f"{msg}\n{line}"
+    return line
+
+
+def resolve_product_label(host: Host | None, platform: Platform | None = None) -> tuple[str | None, str | None]:
+    if host is None:
+        return None, None
+    product = (host.product or "").strip()
+    if not product:
+        if platform == "ssh":
+            product = "ssh-monitor"
+        elif platform == "windows":
+            product = "rdp-login-monitor"
+    version = (host.product_version or "").strip() or None
+    return (product or None), version
 
 
 def host_server_line(host: Host | None) -> str:
@@ -101,7 +185,7 @@ def ensure_agent_version_line(body: str, version: str | None) -> str:
 
 def _fix_active_users_header_count(header_line: str, user_count: int) -> str:
     stripped = header_line.rstrip()
-    if _ACTIVE_USERS_COUNT_RE.match(stripped):
+    if _ACTIVE_USERS_HEADER_RE.match(stripped.strip()):
         return re.sub(
             r"(\👥\s*АКТИВНЫЕ ПОЛЬЗОВАТЕЛИ\s*\()[^)]+(\))",
             rf"\g<1>{user_count}\2",
@@ -143,7 +227,7 @@ def normalize_active_users_in_body(body: str) -> str:
                 stripped = cur.strip()
                 if not stripped:
                     break
-                if stripped.startswith("Источник:"):
+                if stripped.startswith("Источник:") or stripped.startswith(NOTIFICATION_SOURCE_PREFIX):
                     break
                 if _SECTION_HEADER_RE.match(stripped) and not stripped.startswith("👤"):
                     break
@@ -262,9 +346,18 @@ def build_report_body(
     lines.append("")
     lines.extend(_section_active_users(active_users, sac_generated=sac_generated))
 
-    if sac_generated:
-        lines.append("")
-        lines.append("Источник: Security Alert Center (агрегация ingest за 24 ч).")
+    generated_by = "sac" if sac_generated else "agent"
+    product, version = resolve_product_label(host, platform)
+    if not sac_generated and agent_version:
+        version = agent_version
+    lines.append("")
+    lines.append(
+        format_notification_source_plain(
+            generated_by=generated_by,
+            product=product,
+            product_version=version,
+        )
+    )
     return "\n".join(lines)
 
 
@@ -307,6 +400,21 @@ def normalize_daily_report_details(
         return details
 
     normalized_body = normalize_report_body(body, host, platform)
+    gb = str(details.get("generated_by") or "agent").strip().lower()
+    if gb not in ("agent", "sac"):
+        gb = "agent"
+    product, version = resolve_product_label(host, platform)
+    stats_raw = details.get("stats")
+    if isinstance(stats_raw, dict) and gb == "agent":
+        av = stats_raw.get("agent_version") or stats_raw.get("product_version")
+        if av:
+            version = str(av).strip()
+    normalized_body = append_notification_source_plain(
+        normalized_body,
+        generated_by=gb,
+        product=product,
+        product_version=version,
+    )
     out = dict(details)
     out["report_body"] = normalized_body
     out["report_html"] = body_to_report_html(normalized_body)
diff --git a/backend/app/services/telegram_notify.py b/backend/app/services/telegram_notify.py
index 92f874d..9f0f13f 100644
--- a/backend/app/services/telegram_notify.py
+++ b/backend/app/services/telegram_notify.py
@@ -66,7 +66,8 @@ def send_telegram_test_message(*, config: TelegramConfig | None = None) -> None:
     if not cfg.configured:
         raise TelegramNotConfiguredError("Не задан bot token или chat_id")
     send_telegram_text(
-        "✅ <b>SAC: тестовое сообщение</b>\nКанал Telegram для оповещений работает.",
+        "✅ <b>SAC: тестовое сообщение</b>\nКанал Telegram для оповещений работает.\n"
+        "📡 Оповещение: SAC (Security Alert Center)",
         config=cfg,
         force=True,
     )
diff --git a/backend/app/services/telegram_templates.py b/backend/app/services/telegram_templates.py
index 9c64648..92604a6 100644
--- a/backend/app/services/telegram_templates.py
+++ b/backend/app/services/telegram_templates.py
@@ -8,7 +8,11 @@ from datetime import datetime
 from typing import Any
 
 from app.models import Event, Host, Problem
-from app.services.daily_report_format import normalize_report_body
+from app.services.daily_report_format import (
+    append_notification_source_html,
+    normalize_report_body,
+    resolve_product_label,
+)
 
 LOGON_TYPE_NAMES: dict[int, str] = {
     2: "Интерактивный (консоль)",
@@ -91,6 +95,57 @@ def _line(emoji: str, label: str, value: str) -> str:
     return f"{emoji} {label}: {value}\n"
 
 
+def _event_generated_by(event: Event) -> str:
+    details = _details_dict(event)
+    gb = details.get("generated_by")
+    if isinstance(gb, str) and gb.strip().lower() in ("agent", "sac"):
+        return gb.strip().lower()
+    stats = details.get("stats")
+    if isinstance(stats, dict) and stats.get("sac_generated"):
+        return "sac"
+    if event.type in ("report.daily.rdp", "report.daily.ssh") and details.get("report_body"):
+        return "agent"
+    return "agent"
+
+
+def _event_product_version(event: Event) -> tuple[str | None, str | None]:
+    details = _details_dict(event)
+    platform = None
+    if event.type == "report.daily.ssh":
+        platform = "ssh"
+    elif event.type == "report.daily.rdp":
+        platform = "windows"
+    elif event.host is not None:
+        if event.host.os_family == "linux":
+            platform = "ssh"
+        elif event.host.os_family == "windows":
+            platform = "windows"
+    product, version = resolve_product_label(event.host, platform)
+    stats = details.get("stats")
+    if isinstance(stats, dict):
+        av = stats.get("agent_version") or stats.get("product_version")
+        if av:
+            version = str(av).strip()
+    payload = event.payload if isinstance(event.payload, dict) else {}
+    source = payload.get("source")
+    if isinstance(source, dict):
+        if source.get("product"):
+            product = str(source["product"]).strip()
+        if source.get("product_version"):
+            version = str(source["product_version"]).strip()
+    return product, version
+
+
+def _append_event_source(html_msg: str, event: Event) -> str:
+    product, version = _event_product_version(event)
+    return append_notification_source_html(
+        html_msg,
+        generated_by=_event_generated_by(event),
+        product=product,
+        product_version=version,
+    )
+
+
 def format_rdp_login_html(event: Event) -> str:
     details = _details_dict(event)
     is_success = event.type == "rdp.login.success"
@@ -222,34 +277,29 @@ def format_generic_event_html(event: Event) -> str:
     return msg.rstrip()
 
 
-def format_daily_report_html(event: Event) -> str:
-    details = _details_dict(event)
-    platform = "windows" if event.type == "report.daily.rdp" else "ssh"
-    body = _detail(details, "report_body", default="")
-    if body and body != "-":
-        body = normalize_report_body(body, event.host, platform)
-        parts: list[str] = []
-        for i, line in enumerate(body.split("\n")):
-            esc = html.escape(line)
-            if i == 0 and "ЕЖЕДНЕВНЫЙ ОТЧЕТ" in line:
-                parts.append(f"<b>{esc.strip()}</b>")
-            else:
-                parts.append(esc)
-        return "\n".join(parts)
-
-    report_html = details.get("report_html")
-    if isinstance(report_html, str) and report_html.strip():
-        text = sanitize_telegram_html(report_html.strip())
-        return re.sub(r"\n{3,}", "\n\n", text)
-    body = _detail(details, "report_body", default=event.summary)
-    if body != "-":
-        return html.escape(body)
-    return format_generic_event_html(event)
-
-
-def format_event_telegram_html(event: Event) -> str:
+def _format_event_body_html(event: Event) -> str:
     if event.type in ("report.daily.ssh", "report.daily.rdp"):
-        return format_daily_report_html(event)
+        details = _details_dict(event)
+        platform = "windows" if event.type == "report.daily.rdp" else "ssh"
+        body = _detail(details, "report_body", default="")
+        if body and body != "-":
+            body = normalize_report_body(body, event.host, platform)
+            parts: list[str] = []
+            for i, line in enumerate(body.split("\n")):
+                esc = html.escape(line)
+                if i == 0 and "ЕЖЕДНЕВНЫЙ ОТЧЕТ" in line:
+                    parts.append(f"<b>{esc.strip()}</b>")
+                else:
+                    parts.append(esc)
+            return "\n".join(parts)
+        report_html = details.get("report_html")
+        if isinstance(report_html, str) and report_html.strip():
+            text = sanitize_telegram_html(report_html.strip())
+            return re.sub(r"\n{3,}", "\n\n", text)
+        body = _detail(details, "report_body", default=event.summary)
+        if body != "-":
+            return html.escape(body)
+        return format_generic_event_html(event)
     if event.type in ("rdp.login.success", "rdp.login.failed"):
         return format_rdp_login_html(event)
     if event.type in ("ssh.login.success", "ssh.login.failed"):
@@ -265,6 +315,10 @@ def format_event_telegram_html(event: Event) -> str:
     return format_generic_event_html(event)
 
 
+def format_event_telegram_html(event: Event) -> str:
+    return _append_event_source(_format_event_body_html(event), event)
+
+
 def _format_rdg_html(event: Event) -> str:
     details = _details_dict(event)
     ok = event.type.endswith(".success")
@@ -305,5 +359,5 @@ def format_problem_telegram_html(problem: Problem, event: Event | None = None) -
             "rdp.shadow.control.permission",
             "winrm.session.started",
         ):
-            msg += "\n" + format_event_telegram_html(event)
-    return msg.rstrip()
+            msg += "\n" + _format_event_body_html(event)
+    return append_notification_source_html(msg, generated_by="sac")
diff --git a/backend/tests/test_daily_report.py b/backend/tests/test_daily_report.py
index 0fdd85e..bbfd75e 100644
--- a/backend/tests/test_daily_report.py
+++ b/backend/tests/test_daily_report.py
@@ -247,7 +247,9 @@ def test_daily_report_telegram_html_uses_report_html(db_session):
         details={"report_html": "<b>📊 OK</b><br>line"},
         payload={},
     )
-    assert format_event_telegram_html(event) == "<b>📊 OK</b>\nline"
+    assert format_event_telegram_html(event) == (
+        "<b>📊 OK</b>\nline\n📡 Оповещение: агент (ssh-monitor)"
+    )
 
 
 def test_sanitize_telegram_html_strips_div_and_br():
diff --git a/backend/tests/test_daily_report_format.py b/backend/tests/test_daily_report_format.py
index 4822c95..5ef3c45 100644
--- a/backend/tests/test_daily_report_format.py
+++ b/backend/tests/test_daily_report_format.py
@@ -4,8 +4,10 @@ from datetime import datetime, timezone
 
 from app.models import Host
 from app.services.daily_report_format import (
+    append_notification_source_plain,
     build_report_body,
     enrich_stats_for_storage,
+    format_notification_source_plain,
     normalize_active_users_list,
     normalize_report_body,
 )
@@ -74,6 +76,28 @@ def test_build_report_body_windows_layout():
     assert len(lines) == 2
 
 
+def test_build_report_body_includes_notification_source():
+    host = Host(hostname="h1", display_name="H1", os_family="linux", product="ssh-monitor")
+    when = datetime(2026, 5, 29, 9, 0, 5, tzinfo=timezone.utc)
+    stats = enrich_stats_for_storage("ssh", {"successful_ssh": 0, "failed_ssh": 0, "sudo_commands": 0, "active_bans": 0})
+    sac_body = build_report_body("ssh", host, stats, when, sac_generated=True)
+    assert "📡 Оповещение: SAC (Security Alert Center)" in sac_body
+    agent_body = build_report_body(
+        "ssh",
+        host,
+        {**stats, "agent_version": "1.2.11-SAC"},
+        when,
+        sac_generated=False,
+    )
+    assert "📡 Оповещение: агент (ssh-monitor 1.2.11-SAC)" in agent_body
+
+
+def test_append_notification_source_plain_dedupes():
+    line = format_notification_source_plain(generated_by="sac")
+    body = append_notification_source_plain(f"title\n\n{line}", generated_by="sac")
+    assert body.count("📡 Оповещение:") == 1
+
+
 def test_normalize_active_users_list_splits_combined_line():
     users = normalize_active_users_list(["👤 k.khodasevich 👤 papatramp"])
     assert len(users) == 2
diff --git a/backend/tests/test_telegram_templates.py b/backend/tests/test_telegram_templates.py
index 297f628..1bfbb31 100644
--- a/backend/tests/test_telegram_templates.py
+++ b/backend/tests/test_telegram_templates.py
@@ -65,6 +65,26 @@ def test_rdp_success_template():
     text = format_event_telegram_html(event)
     assert "УСПЕШНЫЙ" in text
     assert "Сеть/RDP" in text
+    assert "📡 Оповещение: агент" in text
+
+
+def test_event_telegram_includes_sac_source_for_sac_daily_report():
+    host = Host(hostname="h1", display_name="H1", os_family="linux", product="ssh-monitor")
+    event = Event(
+        event_id="00000000-0000-4000-8000-000000000504",
+        host_id=1,
+        host=host,
+        occurred_at=datetime(2026, 5, 29, 9, 0, tzinfo=timezone.utc),
+        category="report",
+        type="report.daily.ssh",
+        severity="info",
+        title="Отчёт",
+        summary="short",
+        details={"generated_by": "sac", "report_body": "📊 ЕЖЕДНЕВНЫЙ ОТЧЕТ SSH МОНИТОРИНГА\nline"},
+        payload={},
+    )
+    text = format_event_telegram_html(event)
+    assert "📡 Оповещение: SAC (Security Alert Center)" in text
 
 
 def test_rdp_shadow_control_template():