diff --git a/app/core/utils.py b/app/core/utils.py
index 09763bb..d7349f3 100644
--- a/app/core/utils.py
+++ b/app/core/utils.py
@@ -106,33 +106,3 @@ END:VCALENDAR"""
     except Exception as e:
         logging.getLogger("caldav").error(f"CalDAV VTODO 생성 실패: {e}")
         return None
-
-
-# ─── SMTP 헬퍼 ───
-
-
-def send_smtp_email(
-    host: str,
-    port: int,
-    username: str,
-    password: str,
-    subject: str,
-    body: str,
-    to_addr: str | None = None,
-):
-    """Synology MailPlus SMTP로 이메일 발송"""
-    import smtplib
-    from email.mime.text import MIMEText
-
-    to_addr = to_addr or username
-    msg = MIMEText(body, "plain", "utf-8")
-    msg["Subject"] = subject
-    msg["From"] = username
-    msg["To"] = to_addr
-
-    try:
-        with smtplib.SMTP_SSL(host, port, timeout=30) as server:
-            server.login(username, password)
-            server.send_message(msg)
-    except Exception as e:
-        logging.getLogger("smtp").error(f"SMTP 발송 실패: {e}")
diff --git a/app/workers/daily_digest.py b/app/workers/daily_digest.py
index edd31e0..be68abd 100644
--- a/app/workers/daily_digest.py
+++ b/app/workers/daily_digest.py
@@ -1,10 +1,10 @@
-"""일일 다이제스트 워커 — PostgreSQL/CalDAV 쿼리 → Markdown + SMTP
+"""일일 다이제스트 워커 — PostgreSQL/CalDAV 쿼리 → Markdown 생성
 
 v1 scripts/pkm_daily_digest.py에서 포팅.
 DEVONthink/OmniFocus → PostgreSQL/CalDAV 쿼리로 전환.
+SMTP 발송은 2026-06-10 제거 (한 번도 전달 성공한 적 없는 기능 — 폐기 결정).
 """
 
-import os
 from datetime import datetime, timezone
 from zoneinfo import ZoneInfo
 from pathlib import Path
@@ -13,7 +13,7 @@ from sqlalchemy import func, select, text
 
 from core.config import settings
 from core.database import async_session
-from core.utils import send_smtp_email, setup_logger
+from core.utils import setup_logger
 from models.document import Document
 from models.queue import ProcessingQueue
 
@@ -133,16 +133,4 @@ async def run():
         if old.stat().st_mtime < cutoff:
             old.rename(archive_dir / old.name)
 
-    # ─── SMTP 발송 ───
-    smtp_host = os.getenv("MAILPLUS_HOST", "")
-    smtp_port = int(os.getenv("MAILPLUS_SMTP_PORT", "465"))
-    smtp_user = os.getenv("MAILPLUS_USER", "")
-    smtp_pass = os.getenv("MAILPLUS_PASS", "")
-    if smtp_host and smtp_user:
-        send_smtp_email(
-            smtp_host, smtp_port, smtp_user, smtp_pass,
-            f"PKM 다이제스트 — {date_display}",
-            markdown,
-        )
-
     logger.info(f"다이제스트 생성 완료: {digest_path}")
diff --git a/app/workers/law_monitor.py b/app/workers/law_monitor.py
index 5212592..a520429 100644
--- a/app/workers/law_monitor.py
+++ b/app/workers/law_monitor.py
@@ -15,7 +15,7 @@ from sqlalchemy import select
 
 from core.config import settings
 from core.database import async_session
-from core.utils import create_caldav_todo, escape_ical_text, file_hash, send_smtp_email, setup_logger
+from core.utils import create_caldav_todo, file_hash, setup_logger
 from models.automation import AutomationState
 from models.document import Document
 from models.queue import enqueue_stage
@@ -337,8 +337,7 @@ def _safe_name(name: str) -> str:
 
 
 def _send_notifications(law_name: str, proclamation_date: str, revision_type: str):
-    """CalDAV + SMTP 알림"""
-    # CalDAV
+    """CalDAV 할일 알림 (SMTP 발송은 2026-06-10 폐기 — CalDAV 가 단일 알림 채널)"""
     caldav_url = os.getenv("CALDAV_URL", "")
     caldav_user = os.getenv("CALDAV_USER", "")
     caldav_pass = os.getenv("CALDAV_PASS", "")
@@ -349,15 +348,3 @@ def _send_notifications(law_name: str, proclamation_date: str, revision_type: st
             description=f"공포일자: {proclamation_date}, 개정구분: {revision_type}",
             due_days=7,
         )
-
-    # SMTP
-    smtp_host = os.getenv("MAILPLUS_HOST", "")
-    smtp_port = int(os.getenv("MAILPLUS_SMTP_PORT", "465"))
-    smtp_user = os.getenv("MAILPLUS_USER", "")
-    smtp_pass = os.getenv("MAILPLUS_PASS", "")
-    if smtp_host and smtp_user:
-        send_smtp_email(
-            smtp_host, smtp_port, smtp_user, smtp_pass,
-            subject=f"[법령 변경] {law_name} ({revision_type})",
-            body=f"법령명: {law_name}\n공포일자: {proclamation_date}\n개정구분: {revision_type}",
-        )
diff --git a/app/workers/mailplus_archive.py b/app/workers/mailplus_archive.py
index 7bbfd4d..ac0948d 100644
--- a/app/workers/mailplus_archive.py
+++ b/app/workers/mailplus_archive.py
@@ -17,7 +17,7 @@ from sqlalchemy import select
 
 from core.config import settings
 from core.database import async_session
-from core.utils import file_hash, send_smtp_email, setup_logger
+from core.utils import file_hash, setup_logger
 from models.automation import AutomationState
 from models.document import Document
 from models.queue import enqueue_stage
@@ -201,11 +201,4 @@ async def run():
 
         await session.commit()
 
-        # SMTP 알림
-        smtp_host = os.getenv("MAILPLUS_HOST", "")
-        smtp_port = int(os.getenv("MAILPLUS_SMTP_PORT", "465"))
-        if archived and smtp_host:
-            body = f"이메일 {len(archived)}건 수집 완료:\n\n" + "\n".join(f"- {s}" for s in archived)
-            send_smtp_email(smtp_host, smtp_port, user, password, "PKM 이메일 수집 알림", body)
-
         logger.info(f"이메일 {len(archived)}건 수집 완료 (max_uid={max_uid})")