diff --git a/trytond/CHANGELOG b/trytond/CHANGELOG
index 639015b8f7..ce605b6bba 100644
--- a/trytond/CHANGELOG
+++ b/trytond/CHANGELOG
@@ -1,3 +1,4 @@
+* Set Message-Id to email sent
 * Add pair/unpair in tools
 
 Version 7.6.0 - 2025-04-28
diff --git a/trytond/trytond/ir/email_.py b/trytond/trytond/ir/email_.py
index 04a242f8d3..71ee919409 100644
--- a/trytond/trytond/ir/email_.py
+++ b/trytond/trytond/ir/email_.py
@@ -69,6 +69,7 @@ class Email(ResourceAccessMixin, ModelSQL, ModelView):
         'ir.email.address', 'email', "Addresses", readonly=True)
     subject = fields.Char("Subject", readonly=True)
     body = fields.Text("Body", readonly=True)
+    message_id = fields.Char("Message-ID", readonly=True)
 
     @classmethod
     def __setup__(cls):
@@ -228,6 +229,7 @@ class Email(ResourceAccessMixin, ModelSQL, ModelView):
             recipients_hidden=msg['Bcc'],
             addresses=[{'address': a} for a in to_addrs],
             subject=msg['Subject'],
+            message_id=msg['Message-ID'],
             **values)
 
 
diff --git a/trytond/trytond/ir/view/email_form.xml b/trytond/trytond/ir/view/email_form.xml
index b60307d7fa..2620b6b277 100644
--- a/trytond/trytond/ir/view/email_form.xml
+++ b/trytond/trytond/ir/view/email_form.xml
@@ -6,6 +6,10 @@ this repository contains the full copyright notices and license terms. -->
     <field name="user"/>
     <label name="at"/>
     <field name="at"/>
+
+    <label name="message_id"/>
+    <field name="message_id" colspan="3"/>
+
     <label name="recipients"/>
     <field name="recipients" colspan="3"/>
     <label name="recipients_secondary"/>
diff --git a/trytond/trytond/ir/view/email_list.xml b/trytond/trytond/ir/view/email_list.xml
index d3398818ef..8f4a5fd326 100644
--- a/trytond/trytond/ir/view/email_list.xml
+++ b/trytond/trytond/ir/view/email_list.xml
@@ -3,6 +3,7 @@
 this repository contains the full copyright notices and license terms. -->
 <tree>
     <field name="resource" expand="2"/>
+    <field name="message_id" optional="1"/>
     <field name="user"/>
     <field name="at" widget="date"/>
     <field name="at" widget="time"/>
diff --git a/trytond/trytond/sendmail.py b/trytond/trytond/sendmail.py
index e64ee39d58..b0f416db54 100644
--- a/trytond/trytond/sendmail.py
+++ b/trytond/trytond/sendmail.py
@@ -5,11 +5,12 @@ import smtplib
 import ssl
 import time
 from email.message import EmailMessage, Message
-from email.utils import formatdate
+from email.utils import formatdate, make_msgid
 from urllib.parse import parse_qs, unquote_plus
 
 from trytond.config import config, parse_uri
 from trytond.transaction import Transaction
+from trytond.url import host
 
 __all__ = [
     'sendmail_transactional', 'sendmail',
@@ -29,6 +30,8 @@ def sendmail_transactional(
 def send_message_transactional(
         msg, from_addr=None, to_addrs=None, transaction=None, datamanager=None,
         strict=False):
+    if not msg['Message-ID']:
+        msg['Message-ID'] = make_msgid(domain=host())
     if transaction is None:
         transaction = Transaction()
     assert isinstance(transaction, Transaction), transaction
@@ -44,6 +47,8 @@ def sendmail(from_addr, to_addrs, msg, server=None, strict=False):
 
 def send_message(
         msg, from_addr=None, to_addrs=None, server=None, strict=False):
+    if not msg['Message-ID']:
+        msg['Message-ID'] = make_msgid(domain=host())
     if server is None:
         server = get_smtp_server(strict=strict)
         if not server:
diff --git a/trytond/trytond/tests/test_ir.py b/trytond/trytond/tests/test_ir.py
index acfe5d62fa..b3a0b83b89 100644
--- a/trytond/trytond/tests/test_ir.py
+++ b/trytond/trytond/tests/test_ir.py
@@ -520,9 +520,13 @@ class IrTestCase(ModuleTestCase):
             )
         report.save()
 
+        def set_message_id(msg, *args, **kwargs):
+            msg['Message-ID'] = 'test'
+
         with patch(
                 'trytond.ir.email_.send_message_transactional'
                 ) as send_message:
+            send_message.side_effect = set_message_id
             email = Email.send(
                 to='"John Doe" <john@example.com>, Jane <jane@example.com>',
                 cc='User <user@example.com>',
@@ -551,6 +555,7 @@ class IrTestCase(ModuleTestCase):
         self.assertEqual(
             [a.address for a in email.addresses],
             addresses)
+        self.assertEqual(email.message_id, 'test')
         self.assertEqual(email.subject, "Email subject")
         self.assertEqual(email.body, '<p>Hello</p>')
         self.assertEqual(len(attachments), 2)
diff --git a/trytond/trytond/tests/test_sendmail.py b/trytond/trytond/tests/test_sendmail.py
index c15ace1587..8a060e425d 100644
--- a/trytond/trytond/tests/test_sendmail.py
+++ b/trytond/trytond/tests/test_sendmail.py
@@ -1,7 +1,7 @@
 # This file is part of Tryton.  The COPYRIGHT file at the top level of
 # this repository contains the full copyright notices and license terms.
 import smtplib
-from email.message import Message
+from email.message import EmailMessage, Message
 from unittest.mock import ANY, MagicMock, Mock, call, patch
 
 from trytond.sendmail import (
@@ -22,7 +22,7 @@ class SendmailTestCase(TestCase):
     @with_transaction()
     def test_sendmail_transactional(self):
         'Test sendmail_transactional'
-        message = MagicMock()
+        message = EmailMessage()
         datamanager = Mock()
         sendmail_transactional(
             'tryton@example.com', 'foo@example.com', message,
@@ -30,16 +30,42 @@ class SendmailTestCase(TestCase):
 
         datamanager.put.assert_called_once_with(
             'tryton@example.com', 'foo@example.com', message)
+        self.assertTrue(message['Message-ID'])
+
+    @with_transaction()
+    def test_sendmail_transactional_keeps_message_id(self):
+        "Test sendmail_transactional keeps Message-ID"
+        message = EmailMessage()
+        message['Message-ID'] = 'test'
+
+        datamanager = Mock()
+        sendmail_transactional(
+            'tryton@example.com', 'foo@example.com', message,
+            datamanager=datamanager)
+
+        self.assertEqual(message['Message-ID'], 'test')
 
     def test_sendmail(self):
         'Test sendmail'
-        message = MagicMock()
+        message = EmailMessage()
         server = Mock()
         sendmail(
             'tryton@example.com', 'foo@example.com', message, server=server)
         server.send_message.assert_called_with(
             message, 'tryton@example.com', 'foo@example.com')
         server.quit.assert_not_called()
+        self.assertTrue(message['Message-ID'])
+
+    def test_sendmail_keeps_message_id(self):
+        "Test sendmail keeps Message-ID"
+        message = EmailMessage()
+        message['Message-ID'] = 'test'
+
+        server = Mock()
+        sendmail(
+            'tryton@example.com', 'foo@example.com', message, server=server)
+
+        self.assertEqual(message['Message-ID'], 'test')
 
     def test_get_smtp_server(self):
         'Test get_smtp_server'