diff --git a/src/app/admin/page.tsx b/src/app/admin/page.tsx
index 8b41d9f..ee81703 100644
--- a/src/app/admin/page.tsx
+++ b/src/app/admin/page.tsx
@@ -694,7 +694,7 @@ export default function AdminPage() {
                               <span className="text-muted-foreground">TLS</span>
                               <span>{smtpStatus.tls ? "Ja" : "Nein"}</span>
                               <span className="text-muted-foreground">Max. Größe</span>
-                              <span>{smtpStatus.max_size_mb > 0 ? `${smtpStatus.max_size_mb} MB` : "50 MB"}</span>
+                              <span>{(smtpStatus.max_size_mb ?? 0) > 0 ? `${smtpStatus.max_size_mb} MB` : "50 MB"}</span>
                             </div>
                           ) : (
                             <p className="text-sm text-muted-foreground">Nicht erreichbar</p>
@@ -711,9 +711,9 @@ export default function AdminPage() {
                           {smtpStatus ? (
                             <div className="grid grid-cols-2 gap-1 text-sm">
                               <span className="text-muted-foreground">Empfangen</span>
-                              <span className="font-semibold text-green-600">{smtpStatus.received}</span>
+                              <span className="font-semibold text-green-600">{smtpStatus.received ?? 0}</span>
                               <span className="text-muted-foreground">Abgelehnt</span>
-                              <span className="font-semibold text-red-500">{smtpStatus.rejected}</span>
+                              <span className="font-semibold text-red-500">{smtpStatus.rejected ?? 0}</span>
                               <span className="text-muted-foreground">Letzte Mail</span>
                               <span className="text-xs">
                                 {smtpStatus.last_mail_at