A very simple and ridumentary loginfail plugin

plugins/loginfail/loginfail.html.sample

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+<script type="text/javascript">
+    $(document).ready(function(){
+        $('.loginfail').fadeIn(1000);
+    })
+</script>
+
+
+<div class="loginfail" style="display: none; position: relative; align: center;">
+    <br clear="all" />
+    <hr width="30%" />
+    <div align="center">
+        <p>
+            <i>This is an example placeholder for information about your login having failed.</i>
+        </p>
+    </div>
+</div>
+

plugins/loginfail/loginfail.php

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+<?php
+    class loginfail extends rcube_plugin {
+        public $task = 'login';
+
+        function init() {
+            $this->add_hook('login_failed', array($this, 'login_failed'));
+        }
+
+        public function login_failed($args) {
+            $rcmail = rcmail::get_instance();
+
+            $filename = $this->home . '/loginfail.html';
+
+            if (file_exists($filename)) {
+                $html = file_get_contents($filename);
+                $rcmail->output->add_footer($html);
+            }
+        }
+    }
+?>