diff --git a/packages/twenty-server/src/engine/core-modules/tool/tools/email-tool/email-composer.service.ts b/packages/twenty-server/src/engine/core-modules/tool/tools/email-tool/email-composer.service.ts
index 8293a26262a..3237eb62e97 100644
--- a/packages/twenty-server/src/engine/core-modules/tool/tools/email-tool/email-composer.service.ts
+++ b/packages/twenty-server/src/engine/core-modules/tool/tools/email-tool/email-composer.service.ts
@@ -23,6 +23,7 @@ import {
 import { type ComposeEmailParams } from 'src/engine/core-modules/tool/tools/email-tool/types/compose-email-params.type';
 import { EmailComposerResult } from 'src/engine/core-modules/tool/tools/email-tool/types/email-composer-result.type';
 import { parseCommaSeparatedEmails } from 'src/engine/core-modules/tool/tools/email-tool/utils/parse-comma-separated-emails.util';
+import { renderEmailBodyToHtml } from 'src/engine/core-modules/tool/tools/email-tool/utils/render-email-body.util';
 import { type ToolExecutionContext } from 'src/engine/core-modules/tool/types/tool-execution-context.type';
 import { ConnectedAccountEntity } from 'src/engine/metadata-modules/connected-account/entities/connected-account.entity';
 import { GlobalWorkspaceOrmManager } from 'src/engine/twenty-orm/global-workspace-datasource/global-workspace-orm.manager';
@@ -394,7 +395,8 @@ export class EmailComposerService {
     const window = new JSDOM('').window;
     const purify = DOMPurify(window);
 
-    const sanitizedHtmlBody = purify.sanitize(body || '');
+    const htmlBody = await renderEmailBodyToHtml(body ?? '');
+    const sanitizedHtmlBody = purify.sanitize(htmlBody);
     const plainTextBody = toPlainText(sanitizedHtmlBody);
     const sanitizedSubject = purify.sanitize(subject || '');
 
diff --git a/packages/twenty-server/src/engine/core-modules/tool/tools/email-tool/email-tool.schema.ts b/packages/twenty-server/src/engine/core-modules/tool/tools/email-tool/email-tool.schema.ts
index 8fd92a4592f..5740c2e9538 100644
--- a/packages/twenty-server/src/engine/core-modules/tool/tools/email-tool/email-tool.schema.ts
+++ b/packages/twenty-server/src/engine/core-modules/tool/tools/email-tool/email-tool.schema.ts
@@ -1,4 +1,4 @@
-import { isValidUuid } from 'twenty-shared/utils';
+import { emailDocumentSchema, isValidUuid } from 'twenty-shared/utils';
 import { workflowFileSchema } from 'twenty-shared/workflow';
 import { z } from 'zod';
 
@@ -24,7 +24,14 @@ export const EmailToolInputZodSchema = z.object({
     'Recipients object with to, cc, and bcc fields (comma-separated)',
   ),
   subject: z.string().describe('The email subject line'),
-  body: z.string().describe('The email body content in HTML format'),
+  // The document is the same format campaign bodies use, so one authoring
+  // format serves 1:1 email and campaigns; it is rendered to email-safe
+  // HTML server-side. The HTML string form is kept for compatibility.
+  body: z
+    .union([emailDocumentSchema, z.string()])
+    .describe(
+      'The email body. Preferred: a structured email document ({type: "doc", content: [...]} with paragraph, heading, bulletList/orderedList, image, emailButton, emailSection, emailDivider and emailHtml blocks), rendered to email-safe HTML server-side. An HTML string is also accepted. Campaign-style {{variables}} are not substituted in 1:1 emails.',
+    ),
   connectedAccountId: z
     .string()
     .refine((val) => isValidUuid(val))
diff --git a/packages/twenty-server/src/engine/core-modules/tool/tools/email-tool/types/compose-email-params.type.ts b/packages/twenty-server/src/engine/core-modules/tool/tools/email-tool/types/compose-email-params.type.ts
index efa21b1d4c3..255bcf7a8a2 100644
--- a/packages/twenty-server/src/engine/core-modules/tool/tools/email-tool/types/compose-email-params.type.ts
+++ b/packages/twenty-server/src/engine/core-modules/tool/tools/email-tool/types/compose-email-params.type.ts
@@ -1,4 +1,5 @@
 import { type EmailAttachment } from 'twenty-shared/types';
+import { type EmailDocument } from 'twenty-shared/utils';
 
 export type ComposeEmailParams = {
   recipients: {
@@ -7,7 +8,7 @@ export type ComposeEmailParams = {
     bcc?: string;
   };
   subject: string;
-  body: string;
+  body: string | EmailDocument;
   connectedAccountId?: string;
   files?: Array<EmailAttachment>;
   inReplyTo?: string;
diff --git a/packages/twenty-server/src/engine/core-modules/tool/tools/email-tool/utils/__tests__/render-email-body.util.spec.ts b/packages/twenty-server/src/engine/core-modules/tool/tools/email-tool/utils/__tests__/render-email-body.util.spec.ts
new file mode 100644
index 00000000000..17f08172ccd
--- /dev/null
+++ b/packages/twenty-server/src/engine/core-modules/tool/tools/email-tool/utils/__tests__/render-email-body.util.spec.ts
@@ -0,0 +1,42 @@
+import { renderEmailBodyToHtml } from 'src/engine/core-modules/tool/tools/email-tool/utils/render-email-body.util';
+
+jest.mock(
+  'src/engine/core-modules/tool/tools/email-tool/utils/render-rich-text-to-html.util',
+  () => ({
+    renderRichTextToHtml: jest.fn().mockResolvedValue('<p>rendered html</p>'),
+  }),
+);
+
+const { renderRichTextToHtml } = jest.requireMock(
+  'src/engine/core-modules/tool/tools/email-tool/utils/render-rich-text-to-html.util',
+);
+
+describe('renderEmailBodyToHtml', () => {
+  afterEach(() => {
+    jest.clearAllMocks();
+  });
+
+  it('should pass an HTML string through untouched', async () => {
+    const html = '<p>Hello <strong>there</strong></p>';
+
+    await expect(renderEmailBodyToHtml(html)).resolves.toBe(html);
+    expect(renderRichTextToHtml).not.toHaveBeenCalled();
+  });
+
+  it('should render an email document through the shared renderer', async () => {
+    const document = {
+      type: 'doc' as const,
+      content: [
+        {
+          type: 'paragraph',
+          content: [{ type: 'text', text: 'Hello' }],
+        },
+      ],
+    };
+
+    await expect(renderEmailBodyToHtml(document)).resolves.toBe(
+      '<p>rendered html</p>',
+    );
+    expect(renderRichTextToHtml).toHaveBeenCalledWith(document);
+  });
+});
diff --git a/packages/twenty-server/src/engine/core-modules/tool/tools/email-tool/utils/render-email-body.util.ts b/packages/twenty-server/src/engine/core-modules/tool/tools/email-tool/utils/render-email-body.util.ts
new file mode 100644
index 00000000000..697be054999
--- /dev/null
+++ b/packages/twenty-server/src/engine/core-modules/tool/tools/email-tool/utils/render-email-body.util.ts
@@ -0,0 +1,17 @@
+import { type JSONContent } from 'twenty-emails';
+import { type EmailDocument } from 'twenty-shared/utils';
+
+import { renderRichTextToHtml } from 'src/engine/core-modules/tool/tools/email-tool/utils/render-rich-text-to-html.util';
+
+// 1:1 email bodies and campaign bodies share one authoring format: the email
+// document. A document renders through the same renderer campaigns use; a
+// plain string is treated as ready-made HTML for compatibility.
+export const renderEmailBodyToHtml = async (
+  body: string | EmailDocument,
+): Promise<string> => {
+  if (typeof body === 'string') {
+    return body;
+  }
+
+  return renderRichTextToHtml(body as JSONContent);
+};