fix(projekt-matching): store outgoing mail copies in Sent via IMAP append

projekt-matching/projektmatch/mailer.py

@@ -71,6 +71,39 @@ class MailBox:
             pass
 
 
+def _sent_folder(conn):
+    """Find the server's Sent folder via special-use flag, fallback names."""
+    typ, data = conn.list()
+    candidates = []
+    for raw in data or []:
+        line = raw.decode() if isinstance(raw, bytes) else str(raw)
+        name = line.rsplit(" ", 1)[-1].strip('"')
+        if "\\Sent" in line.split(")")[0]:
+            return name
+        candidates.append(name)
+    for cand in ("Sent", "INBOX.Sent"):
+        if cand in candidates:
+            return cand
+    return "Sent"
+
+
+def append_sent(user, password, msg, conn=None):
+    """Store a copy of an outgoing message in the Sent folder (best effort)."""
+    own = conn is None
+    conn = conn or imaplib.IMAP4_SSL(IMAP_HOST, IMAP_PORT)
+    try:
+        if own:
+            conn.login(user, password)
+        folder = _sent_folder(conn)
+        conn.append(folder, "(\\Seen)", None, msg.as_bytes())
+    finally:
+        if own:
+            try:
+                conn.logout()
+            except Exception:
+                pass
+
+
 def send_mail(user, password, to, subject, body):
     msg = EmailMessage()
     msg["From"], msg["To"], msg["Subject"] = user, to, subject
@@ -81,3 +114,7 @@ def send_mail(user, password, to, subject, body):
         server.starttls(context=ssl.create_default_context())
         server.login(user, password)
         server.send_message(msg)
+    try:
+        append_sent(user, password, msg)
+    except Exception:      # noqa: BLE001 — copy is best effort; the mail went out
+        pass