Blocking senders is a free feature

app/src/main/java/eu/faircode/email/Core.java

@@ -4946,12 +4946,13 @@ class Core {
 
         if (account.protocol == EntityAccount.TYPE_IMAP && folder.read_only)
             return;
-        if (!ActivityBilling.isPro(context))
-            return;
+
+        boolean pro = ActivityBilling.isPro(context);
 
         DB db = DB.getInstance(context);
         try {
             boolean executed = false;
+            if (pro)
                 for (EntityRule rule : rules)
                     if (rule.matches(context, message, headers, html)) {
                         rule.execute(context, message);