diff --git a/src/tools/index.ts b/src/tools/index.ts
index 388cfaf49..886db95d9 100644
--- a/src/tools/index.ts
+++ b/src/tools/index.ts
@@ -2,6 +2,7 @@ import { tool as base64FileConverter } from './base64-file-converter';
 import { tool as base64StringConverter } from './base64-string-converter';
 import { tool as basicAuthGenerator } from './basic-auth-generator';
 import { tool as emailNormalizer } from './email-normalizer';
+import { tool as xVrSpamcauseDecoder } from './x-vr-spamcause-decoder';
 
 import { tool as asciiTextDrawer } from './ascii-text-drawer';
 
@@ -164,7 +165,15 @@ export const toolsByCategory: ToolCategory[] = [
   },
   {
     name: 'Network',
-    components: [ipv4SubnetCalculator, ipv4AddressConverter, ipv4RangeExpander, macAddressLookup, macAddressGenerator, ipv6UlaGenerator],
+    components: [
+      ipv4SubnetCalculator,
+      ipv4AddressConverter,
+      ipv4RangeExpander,
+      macAddressLookup,
+      macAddressGenerator,
+      ipv6UlaGenerator,
+      xVrSpamcauseDecoder,
+    ],
   },
   {
     name: 'Math',
diff --git a/src/tools/x-vr-spamcause-decoder/index.ts b/src/tools/x-vr-spamcause-decoder/index.ts
new file mode 100644
index 000000000..e544e9821
--- /dev/null
+++ b/src/tools/x-vr-spamcause-decoder/index.ts
@@ -0,0 +1,12 @@
+import { RecordMail } from '@vicons/tabler';
+import { defineTool } from '../tool';
+
+export const tool = defineTool({
+  name: 'X vr spamcause decoder',
+  path: '/x-vr-spamcause-decoder',
+  description: 'Decode X-VR-SPAMCAUSE header in OVH mails',
+  keywords: ['ovh', 'vade', 'retro', 'vr', 'spam', 'spamcause', 'decoder'],
+  component: () => import('./x-vr-spamcause-decoder.vue'),
+  icon: RecordMail,
+  createdAt: new Date('2024-08-15'),
+});
diff --git a/src/tools/x-vr-spamcause-decoder/x-vr-spamcause-decoder.service.test.ts b/src/tools/x-vr-spamcause-decoder/x-vr-spamcause-decoder.service.test.ts
new file mode 100644
index 000000000..22f4bda6f
--- /dev/null
+++ b/src/tools/x-vr-spamcause-decoder/x-vr-spamcause-decoder.service.test.ts
@@ -0,0 +1,10 @@
+import { describe, expect, it } from 'vitest';
+import { spamCauseDecode } from './x-vr-spamcause-decoder.service';
+
+describe('x-vr-spamcause-decoder', () => {
+  it('should decode X-VR-SPAMCAUSE', () => {
+    expect(spamCauseDecode('gggruggvucftvghtrhhoucdtuddrfeelgedrvdduucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuqfggjfenuceurghilhhouhhtmecufedttdenucgohfhorhgsihguuggvnhfjughrucdlhedttddm')).toBe(
+      'Vade Retro 01.394.21 AS+AV+AP+RT Profile: OVH; Bailout: 300; ^ForbiddenHdr (500)',
+    );
+  });
+});
diff --git a/src/tools/x-vr-spamcause-decoder/x-vr-spamcause-decoder.service.ts b/src/tools/x-vr-spamcause-decoder/x-vr-spamcause-decoder.service.ts
new file mode 100644
index 000000000..ffb0135d5
--- /dev/null
+++ b/src/tools/x-vr-spamcause-decoder/x-vr-spamcause-decoder.service.ts
@@ -0,0 +1,24 @@
+function unrot(a: string, b: string, pos: number) {
+  if (b === undefined) {
+    return '';
+  }
+
+  if (pos % 2 === 0) {
+    const c = a;
+    a = b;
+    b = c;
+  }
+
+  const offset = ('g'.charCodeAt(0) - a.charCodeAt(0)) * 16;
+  return String.fromCharCode((a.charCodeAt(0) + b.charCodeAt(0)) - 'x'.charCodeAt(0) - offset);
+}
+
+export function spamCauseDecode(text: string) {
+  let result = '';
+
+  for (let n = 0; n < text.length; n += 2) {
+    result += unrot(text[n], text[n + 1], Math.floor(n / 2));
+  }
+
+  return result;
+}
diff --git a/src/tools/x-vr-spamcause-decoder/x-vr-spamcause-decoder.vue b/src/tools/x-vr-spamcause-decoder/x-vr-spamcause-decoder.vue
new file mode 100644
index 000000000..317892871
--- /dev/null
+++ b/src/tools/x-vr-spamcause-decoder/x-vr-spamcause-decoder.vue
@@ -0,0 +1,24 @@
+<script setup lang="ts">
+import { spamCauseDecode } from './x-vr-spamcause-decoder.service';
+
+const encodedXVRSpamCause = ref('');
+const decoded = computed(() => spamCauseDecode(encodedXVRSpamCause.value));
+</script>
+
+<template>
+  <div>
+    <c-input-text
+      v-model:value="encodedXVRSpamCause"
+      label="Encoded X-VR-SPAMCAUSE:"
+      multiline
+      rows="1"
+      autosize
+      placeholder="Your X-VR-SPAMCAUSE header value..."
+      mb-6
+    />
+
+    <n-divider />
+
+    <textarea-copyable readonly label="Decoded" :value="decoded" />
+  </div>
+</template>