diff --git a/backend/00-router.go b/backend/00-router.go
index a2fc6f1..7b82bda 100644
--- a/backend/00-router.go
+++ b/backend/00-router.go
@@ -41,9 +41,9 @@ func renderShell(w http.ResponseWriter, active, readingPane string) {
 	fmt.Fprintf(w, `<!doctype html><html lang="de"><head><meta charset="utf-8">
 <meta name="viewport" content="width=device-width,initial-scale=1">
 <title>Mail-Graveyard</title>
-<link rel="stylesheet" href="/static/style.css">
+<link rel="stylesheet" href="/static/style.css?v=20260706-2">
 <script src="/static/htmx.min.js"></script>
-<script src="/static/app.js" defer></script></head>
+<script src="/static/app.js?v=20260706-2" defer></script></head>
 <body class="ol2013">
 <header class="ribbon">
   <nav class="ribbon-tabs">
@@ -65,13 +65,12 @@ func renderShell(w http.ResponseWriter, active, readingPane string) {
   </section>
   <div class="pane-resizer" data-resize-index="1"></div>
   <section class="pane pane-read" id="read">
-    <div class="pane-head">Quelle</div>
-    <div class="read-body">%s</div>
+    %s
   </section>
 </div>
 <footer class="statusbar"><span id="mig-status"
     hx-get="/migrate/status" hx-trigger="every 3s" hx-swap="innerHTML">bereit</span></footer>
-</body></html>`, active, readingPane)
+</body></html>`, active, renderInitialReadPane(readingPane))
 }
 
 // --- Stubs fuer die noch nicht gebauten Handler (TODO Codex) ---
diff --git a/backend/08-viewer.go b/backend/08-viewer.go
index 3c7d4cc..bce1eec 100644
--- a/backend/08-viewer.go
+++ b/backend/08-viewer.go
@@ -262,6 +262,21 @@ func renderInitialTargetPane() string {
 	return `<div class="pane-head mode-head"><div class="mode-switch"><button class="btn compact active" type="button">Quelle</button><button class="btn secondary compact" type="button">Ziel</button></div><div></div></div><div class="read-body"><div class="ef-empty">Nachricht waehlen.</div></div>`
 }
 
+func renderInitialReadPane(body string) string {
+	if strings.TrimSpace(body) == "" {
+		body = `<div class="ef-empty">Nachricht waehlen.</div>`
+	}
+	var b strings.Builder
+	b.WriteString(`<div class="pane-head mode-head"><div class="mode-switch"><button class="btn compact active" type="button">Quelle</button><button class="btn secondary compact" type="button">Ziel</button></div><form class="target-select-form"><select id="source-account-select" name="source" class="target-select">`)
+	for _, opt := range sourceAccountOptions() {
+		fmt.Fprintf(&b, `<option value="%s">%s</option>`, html.EscapeString(opt.Value), html.EscapeString(opt.Label))
+	}
+	b.WriteString(`</select></form></div><div class="read-body">`)
+	b.WriteString(body)
+	b.WriteString(`</div>`)
+	return b.String()
+}
+
 func renderReadContent(w io.Writer, subject, from, date, body string) {
 	if subject == "" {
 		subject = "(ohne Betreff)"
