diff --git a/src/server/BreCal/__init__.py b/src/server/BreCal/__init__.py
index 964f5b9..8d37e1d 100644
--- a/src/server/BreCal/__init__.py
+++ b/src/server/BreCal/__init__.py
@@ -83,6 +83,8 @@ def create_app(test_config=None, instance_path=None):
     if app.config.get("SECRET_KEY"):
         os.environ["SECRET_KEY"] = app.config["SECRET_KEY"]
 
+    defs.SMTP_DEBUG_LEVEL = app.config.get("SMTP_DEBUG_LEVEL", defs.SMTP_DEBUG_LEVEL)
+
     local_db.initPool(os.path.dirname(app.instance_path), config=app.config)
     logging.info('App started')
 
diff --git a/src/server/BreCal/schemas/defs.py b/src/server/BreCal/schemas/defs.py
index 019345e..3d92c54 100644
--- a/src/server/BreCal/schemas/defs.py
+++ b/src/server/BreCal/schemas/defs.py
@@ -18,3 +18,6 @@ shipcall_types = {
     3: "Shifting"
 }
 
+# Email transport logging (0 = quiet, 1 = verbose)
+SMTP_DEBUG_LEVEL = 0
+
diff --git a/src/server/BreCal/services/schedule_routines.py b/src/server/BreCal/services/schedule_routines.py
index 61e36cc..da28be8 100644
--- a/src/server/BreCal/services/schedule_routines.py
+++ b/src/server/BreCal/services/schedule_routines.py
@@ -142,7 +142,11 @@ def SendEmails(email_dict):
             conn = smtplib.SMTP_SSL(defs.email_credentials["server"], defs.email_credentials["port"])
         else:
             conn = smtplib.SMTP(defs.email_credentials["server"], defs.email_credentials["port"])
-        conn.set_debuglevel(1) # set this to 0 to disable debug output to log
+        try:
+            smtp_debug_level = int(defs.SMTP_DEBUG_LEVEL)
+        except (TypeError, ValueError):
+            smtp_debug_level = 0
+        conn.set_debuglevel(1 if smtp_debug_level else 0)
         conn.ehlo()
         if encryption_norm in ("STARTTLS", "STARTSSL"):
             conn.starttls()
@@ -306,6 +310,13 @@ def SendNotifications():
                             pass
 
             # mark as sent
+            logging.info(
+                "Notification finalized (level=2): id=%s shipcall_id=%s participant_id=%s type=%s",
+                notification.id,
+                notification.shipcall_id,
+                notification.participant_id,
+                notification.type,
+            )
             commands.execute("UPDATE notification SET level = 2 WHERE id = ?id?", param={"id":notification.id})
 
         # send emails (if any)