[ADD] AI: Email templates

closes odoo/documentation#16173

Signed-off-by: Felicia Kuan (feku) <feku@odoo.com>

content/applications/productivity/ai.rst

@@ -91,4 +91,5 @@ Below are some common requests that the *Ask AI* agent can assist with:
    ai/webpage
    ai/live-chat
    ai/server-actions
+   ai/email-templates
    ai/voice

content/applications/productivity/ai/email-templates.rst

@@ -0,0 +1,63 @@
+=====================
+AI in email templates
+=====================
+
+.. |AI| replace:: :abbr:`AI (artificial intelligence)`
+
+Odoo allows |AI| prompts to be embedded directly into email templates.
+
+When an email is sent, the prompt is evaluated in context, and the generated content is inserted
+into the message automatically. This feature makes it possible to create dynamic, personalized
+emails at scale, while keeping templates concise and reusable.
+
+An AI-enabled email template contains one or more AI prompts that are evaluated at send time. Unlike
+static templates, AI prompts:
+
+ - Adapt the message content to the current record
+ - Use available context such as customer data, document content, or related records
+ - Generate natural language text automatically
+
+How AI prompts are evaluated in email templates
+===============================================
+
+When the database creates an email based on a template with an AI prompt, the prompt uses the
+current record as context to complete the prompt's objective. If the email is sent in bulk, the
+prompt is evaluated separately for each record. This allows a single template to produce
+personalized content for multiple recipients.
+
+Adding an AI prompt to an email template
+========================================
+
+First, navigate to :menuselection:`Settings --> Technical --> Email Templates`.
+
+.. note::
+   :ref:`Developer mode <developer-mode/activation>` needs to be activated to view the *Technical*
+   menu.
+
+Select an existing template, or click :guilabel:`New` to create a new one. In the body of the
+template, type `/`, to open the :ref:`powerbox <essentials/html_editor/commands>`. Select
+:guilabel:`Prompt` from the drop-down menu. This adds a banner to the template. In the  banner,
+enter a prompt describing the expected output.
+
+To utilize :ref:`dynamic placeholders <email_template/dynamic-placeholders>` within the prompt, type
+`/`, then select :guilabel:`Dynamic Placeholder` from the drop-down menu.
+
+    .. image:: email-templates/template-prompt.png
+      :alt: An email template with an AI prompt.
+
+.. note::
+   Dynamic placeholders reference specific fields within the database to produce unique data in the
+   template. Adding these placeholders is what allows the database to customize the email based on
+   the record referenced.
+
+Example use cases
+=================
+
+- Sales follow-ups: Automatically generate tailored follow-up emails based on opportunity stage,
+  customer activity, or recent communication.
+- HR communication: Generate personalized onboarding or interview emails based on application or
+  employee data.
+- Project updates: Create progress summaries using task descriptions and recent activity.
+
+.. seealso::
+   :doc:`../../general/companies/email_template`