diff --git a/requeue-email.sh b/requeue-email.sh
old mode 100644
new mode 100755
index 7b03fa1..c01a9fc
--- a/requeue-email.sh
+++ b/requeue-email.sh
@@ -91,7 +91,11 @@ fi
 FIRST_RECIPIENT=$(echo "$RECIPIENTS" | cut -d',' -f1 | sed 's/.*<//' | sed 's/>.*//')  # Reinige falls <email>
 EXTRACTED_DOMAIN=$(echo "$FIRST_RECIPIENT" | cut -d'@' -f2)
 
-if [ "$EXTRACTED_DOMAIN" != "$DOMAIN" ]; then
+# Lowercase für case-insensitive Vergleich
+EXTRACTED_DOMAIN_LOWER=$(echo "$EXTRACTED_DOMAIN" | tr '[:upper:]' '[:lower:]')
+DOMAIN_LOWER=$(echo "$DOMAIN" | tr '[:upper:]' '[:lower:]')
+
+if [ "$EXTRACTED_DOMAIN_LOWER" != "$DOMAIN_LOWER" ]; then
     echo "ERROR: Extrahierte Domain ($EXTRACTED_DOMAIN) passt nicht zur angegebenen Domain ($DOMAIN)."
     exit 1
 fi