diff --git a/backend/mailer.py b/backend/mailer.py
index f81fb33..c29f105 100644
--- a/backend/mailer.py
+++ b/backend/mailer.py
@@ -5,11 +5,14 @@ Unterstützt zwei Backends (wird automatisch gewählt):
   2. SMTP            — wenn SMTP_HOST gesetzt (Fallback)
 """
 
+import imaplib
 import os
 import base64
 import smtplib
 import asyncio
 import logging
+import ssl
+from datetime import datetime
 from email.mime.text import MIMEText
 from email.mime.multipart import MIMEMultipart
 from email.mime.application import MIMEApplication
@@ -28,10 +31,70 @@ SMTP_PORT = int(os.getenv("SMTP_PORT", "587"))
 SMTP_USER = os.getenv("SMTP_USER", "")
 SMTP_PASS = os.getenv("SMTP_PASS", "") or os.getenv("SMTP_SUPPORT_PASS", "")
 
+# IMAP für Gesendet-Ordner
+IMAP_HOST = os.getenv("IMAP_HOST", SMTP_HOST)
+IMAP_PORT = int(os.getenv("IMAP_PORT", "993"))
+_SENT_CANDIDATES = ["Sent", "Sent Messages", "Sent Items", "INBOX.Sent", "Gesendete Objekte"]
+
 SMTP_FROM = os.getenv("SMTP_FROM", "Ban Yaro <noreply@banyaro.app>")
 APP_URL   = os.getenv("APP_URL", "https://banyaro.app")
 
 
+# ------------------------------------------------------------------
+# IMAP: Mail in Gesendet-Ordner speichern
+# ------------------------------------------------------------------
+def _imap_save_sent(msg_bytes: bytes):
+    if not IMAP_HOST or not SMTP_USER or not SMTP_PASS:
+        return
+    try:
+        ctx = ssl.create_default_context()
+        with imaplib.IMAP4_SSL(IMAP_HOST, IMAP_PORT, ssl_context=ctx) as imap:
+            imap.login(SMTP_USER, SMTP_PASS)
+            _, raw_folders = imap.list()
+            available = [f.decode(errors="replace") for f in (raw_folders or [])]
+            folder = None
+            for line in available:
+                name = line.rsplit('"." ', 1)[-1].strip().strip('"')
+                for candidate in _SENT_CANDIDATES:
+                    if candidate.lower() in name.lower():
+                        folder = name
+                        break
+                if folder:
+                    break
+            if not folder:
+                folder = "INBOX.Sent"
+            imap.append(
+                folder,
+                r"\Seen",
+                imaplib.Time2Internaldate(datetime.now().timestamp()),
+                msg_bytes,
+            )
+    except Exception as e:
+        logger.warning(f"IMAP Gesendet-Speicherung fehlgeschlagen: {e}")
+
+
+def _build_mime_copy(to: str, subject: str, html: str, plain: str, attachments: list | None) -> MIMEMultipart:
+    """Baut eine MIME-Nachricht für die Gesendet-Ablage (Brevo-Pfad)."""
+    if attachments:
+        msg = MIMEMultipart("mixed")
+        alt = MIMEMultipart("alternative")
+        alt.attach(MIMEText(plain, "plain", "utf-8"))
+        alt.attach(MIMEText(html,  "html",  "utf-8"))
+        msg.attach(alt)
+        for a in attachments:
+            part = MIMEApplication(a["content"], Name=a["filename"])
+            part["Content-Disposition"] = f'attachment; filename="{a["filename"]}"'
+            msg.attach(part)
+    else:
+        msg = MIMEMultipart("alternative")
+        msg.attach(MIMEText(plain, "plain", "utf-8"))
+        msg.attach(MIMEText(html,  "html",  "utf-8"))
+    msg["Subject"] = subject
+    msg["From"]    = SMTP_FROM
+    msg["To"]      = to
+    return msg
+
+
 # ------------------------------------------------------------------
 # Brevo REST-API
 # ------------------------------------------------------------------
@@ -92,12 +155,14 @@ def _send_smtp_sync(to: str, subject: str, html: str, plain: str, attachments: l
     msg["From"]    = SMTP_FROM
     msg["To"]      = to
 
+    msg_bytes = msg.as_bytes()
     with smtplib.SMTP(SMTP_HOST, SMTP_PORT, timeout=10) as s:
         s.ehlo()
         s.starttls()
         if SMTP_USER:
             s.login(SMTP_USER, SMTP_PASS)
-        s.sendmail(SMTP_FROM, [to], msg.as_string())
+        s.sendmail(SMTP_FROM, [to], msg_bytes)
+    _imap_save_sent(msg_bytes)
 
 
 # ------------------------------------------------------------------
@@ -108,6 +173,11 @@ async def send_email(to: str, subject: str, html: str, plain: str = "", attachme
         try:
             await _send_brevo(to, subject, html, plain, attachments)
             logger.info(f"Mail via Brevo gesendet: «{subject}» → {to}")
+            # MIME-Kopie für Gesendet-Ordner konstruieren
+            loop = asyncio.get_event_loop()
+            await loop.run_in_executor(None, lambda: _imap_save_sent(
+                _build_mime_copy(to, subject, html, plain, attachments).as_bytes()
+            ))
             return
         except Exception as e:
             logger.error(f"Brevo-Fehler: {e}")