fix: Datumsparser — mehr RFC-2822-Varianten, kein time.Now() Fallback

pkg/mailparser/parser.go

@@ -81,11 +81,38 @@ func Parse(raw []byte) (*ParsedMail, error) {
 	msgID := msg.Header.Get("Message-Id")
 	pm.MessageID = strings.Trim(msgID, "<>")
 
-	// Date
+	// Date — try go-message parser first, then fallback formats, then zero
 	if d, err := msg.Header.Date(); err == nil {
 		pm.Date = d
 	} else {
-		pm.Date = time.Now()
+		// Some MUAs emit non-standard variants (e.g. "+0100 (CET)" suffix).
+		// Try common RFC 2822 / non-standard formats before giving up.
+		raw := strings.TrimSpace(msg.Header.Get("Date"))
+		// Strip parenthesised timezone comment: "... +0100 (CET)" → "... +0100"
+		if idx := strings.LastIndex(raw, "("); idx > 0 {
+			raw = strings.TrimSpace(raw[:idx])
+		}
+		parsed := false
+		for _, layout := range []string{
+			"Mon, 2 Jan 2006 15:04:05 -0700",
+			"Mon, 02 Jan 2006 15:04:05 -0700",
+			"2 Jan 2006 15:04:05 -0700",
+			"02 Jan 2006 15:04:05 -0700",
+			"Mon, 2 Jan 2006 15:04:05 MST",
+			"Mon, 02 Jan 2006 15:04:05 MST",
+			time.RFC1123Z,
+			time.RFC1123,
+		} {
+			if t, err := time.Parse(layout, raw); err == nil {
+				pm.Date = t
+				parsed = true
+				break
+			}
+		}
+		if !parsed {
+			// Leave pm.Date as zero — storage will use DB DEFAULT NOW()
+			pm.Date = time.Time{}
+		}
 	}
 
 	// Parse body / MIME parts