diff --git a/install_postfix_advanced.sh b/install_postfix_advanced.sh
index bcf826f..c3f296a 100755
--- a/install_postfix_advanced.sh
+++ b/install_postfix_advanced.sh
@@ -902,7 +902,9 @@ if [[ ! -f "/etc/postfix/postfwd.cf" ]]; then
 
 # Blacklist sender adresses
 &&BLOCK_SENDER {
-   sender==file:/etc/postfix/postfwd.bl-sender
+   # =~
+   # using '=~' allows also matching entries for domains (i.e. @acieu.co.uk)
+   sender=~file:/etc/postfix/postfwd.bl-sender
 }
 
 # Inbound emails only
diff --git a/install_postfwd.sh b/install_postfwd.sh
index f4f0fe2..053685a 100755
--- a/install_postfwd.sh
+++ b/install_postfwd.sh
@@ -168,7 +168,9 @@ if [[ ! -f "/etc/postfix/postfwd.cf" ]]; then
 
 # Blacklist sender adresses
 &&BLOCK_SENDER {
-   sender==file:/etc/postfix/postfwd.bl-sender
+   # =~
+   # using '=~' allows also matching entries for domains (i.e. @acieu.co.uk)
+   sender=~file:/etc/postfix/postfwd.bl-sender
 }
 
 # Inbound emails only