diff --git a/includes/class-message-formatter.php b/includes/class-message-formatter.php
index f052bf8..681a915 100644
--- a/includes/class-message-formatter.php
+++ b/includes/class-message-formatter.php
@@ -43,9 +43,15 @@ final class MessageFormatter
 
         $lines = [];
 
-        $label_info = self::LABEL_MAP[$class['label']] ?? self::LABEL_MAP['unclear'];
-        $header = ($ctx['is_retro'] ? '📂 Ретроспектива  ·  ' : '')
-            . $label_info['emoji'] . ' ' . $label_info['text'];
+        $is_dry_run_drop = !empty($ctx['dry_run_drop']);
+
+        if ($is_dry_run_drop) {
+            $header = '[БЫЛО БЫ DROPPED]';
+        } else {
+            $label_info = self::LABEL_MAP[$class['label']] ?? self::LABEL_MAP['unclear'];
+            $header = ($ctx['is_retro'] ? '📂 Ретроспектива  ·  ' : '')
+                . $label_info['emoji'] . ' ' . $label_info['text'];
+        }
 
         $lines[] = $header;
         $lines[] = '🌐 ' . esc_html($ctx['site_title']) . '  ·  форма «' . esc_html($ctx['form_title']) . '»';
@@ -60,6 +66,18 @@ final class MessageFormatter
         $lines[] = '⚙️ Попало в спам: ' . esc_html($ctx['reason']);
         $lines[] = '📊 Классификация: ' . self::format_reasons($class['reasons']);
 
+        if ($is_dry_run_drop) {
+            $rule = '';
+            foreach ($class['reasons'] as $r) {
+                $text = (string)($r['text'] ?? '');
+                if (strpos($text, 'hard-rule:') === 0 || strpos($text, 'score ≤') === 0) {
+                    $rule = $text;
+                    break;
+                }
+            }
+            if ($rule !== '') $lines[] = '🚫 Сработавшее правило: ' . esc_html($rule);
+        }
+
         $meta_bits = [];
         if ($ctx['ip'] !== '')         $meta_bits[] = 'IP ' . esc_html($ctx['ip']);
         if ($ctx['user_agent'] !== '') $meta_bits[] = 'UA ' . esc_html(self::shorten_ua($ctx['user_agent']));
diff --git a/tests/MessageFormatterDryRunTest.php b/tests/MessageFormatterDryRunTest.php
new file mode 100644
index 0000000..8688d0e
--- /dev/null
+++ b/tests/MessageFormatterDryRunTest.php
@@ -0,0 +1,77 @@
+<?php
+declare(strict_types=1);
+
+namespace Cf7stg\Tests;
+
+use Cf7stg\MessageFormatter;
+
+final class MessageFormatterDryRunTest extends Cf7stgTestCase
+{
+    private function ctx(array $overrides = []): array
+    {
+        return array_merge([
+            'fields' => ['your-name' => 'OB', 'tel' => '+79991234567'],
+            'classification' => [
+                'score' => 2,
+                'label' => 'drop',
+                'reasons' => [
+                    ['sign' => '+', 'weight' => 3, 'text' => 'телефон RU'],
+                    ['sign' => '×', 'weight' => 0, 'text' => 'hard-rule: короткое латинское имя'],
+                ],
+            ],
+            'site_title'   => 'домработница.рус',
+            'form_title'   => 'Test',
+            'submitted_at' => '21.04.2026 11:52',
+            'reason'       => 'Akismet',
+            'ip'           => '91.188.244.33',
+            'user_agent'   => 'Mozilla/5.0',
+            'is_retro'     => false,
+            'dry_run_drop' => false,
+        ], $overrides);
+    }
+
+    public function test_dry_run_drop_prefix_in_first_line(): void
+    {
+        $r = MessageFormatter::build($this->ctx(['dry_run_drop' => true]));
+        $first_line = strtok($r['text'], "\n");
+        self::assertStringContainsString('[БЫЛО БЫ DROPPED]', $first_line);
+    }
+
+    public function test_dry_run_drop_includes_triggered_rule_line(): void
+    {
+        $r = MessageFormatter::build($this->ctx(['dry_run_drop' => true]));
+        self::assertStringContainsString('Сработавшее правило: hard-rule: короткое латинское имя', $r['text']);
+    }
+
+    public function test_dry_run_drop_includes_score_based_rule_line(): void
+    {
+        $ctx = $this->ctx([
+            'dry_run_drop' => true,
+            'classification' => [
+                'score' => -7,
+                'label' => 'drop',
+                'reasons' => [
+                    ['sign' => '×', 'weight' => 0, 'text' => 'score ≤ -5'],
+                ],
+            ],
+        ]);
+        $r = MessageFormatter::build($ctx);
+        self::assertStringContainsString('Сработавшее правило: score ≤ -5', $r['text']);
+    }
+
+    public function test_non_drop_payload_no_marker(): void
+    {
+        $r = MessageFormatter::build($this->ctx(['dry_run_drop' => false]));
+        self::assertStringNotContainsString('[БЫЛО БЫ DROPPED]', $r['text']);
+        self::assertStringNotContainsString('Сработавшее правило', $r['text']);
+    }
+
+    public function test_dry_run_drop_header_replaces_label_emoji(): void
+    {
+        // When dry_run_drop is true, the regular ⛔ авто-дроп header must be REPLACED,
+        // not duplicated.
+        $r = MessageFormatter::build($this->ctx(['dry_run_drop' => true]));
+        $first_line = strtok($r['text'], "\n");
+        self::assertStringNotContainsString('авто-дроп', $first_line);
+    }
+}