diff --git a/EnvelopeGenerator.Web/Views/Home/ShowEnvelope.cshtml b/EnvelopeGenerator.Web/Views/Home/ShowEnvelope.cshtml
index 6f0a641d..eac905dc 100644
--- a/EnvelopeGenerator.Web/Views/Home/ShowEnvelope.cshtml
+++ b/EnvelopeGenerator.Web/Views/Home/ShowEnvelope.cshtml
@@ -152,13 +152,23 @@
 @if (!isReadOnly)
 {
 <script nonce="@nonce">
-
     document.getElementById('readonly-send').addEventListener('click', async () => {
         const receiverMail = document.getElementById('readonly-receiver-mail');
         const dateValid = document.getElementById('readonly-date-valid');
 
         const receiverMail_value = receiverMail.value;
         const dateValid_value = dateValid.value;
+    
+        //check the date
+        const tomorrow = new Date(Date.now() + 86400000);
+        if (new Date(dateValid_value) < tomorrow) {
+            Swal.fire({
+                icon: "error",
+                title: "Falsches Datum",
+                text: "Die Verteilung der Umschläge sollte mindestens einen Tag dauern."
+            });
+            return;
+        }
 
         shareEnvelope(receiverMail_value, dateValid_value)
             .then(res => {