diff --git a/modules/marketing_automation/CHANGELOG b/modules/marketing_automation/CHANGELOG
index 19b23a39cc..cb4ae626b6 100644
--- a/modules/marketing_automation/CHANGELOG
+++ b/modules/marketing_automation/CHANGELOG
@@ -1,3 +1,4 @@
+* Support MJML syntax for email
 
 Version 7.8.0 - 2025-12-15
 --------------------------
diff --git a/modules/marketing_automation/marketing_automation.py b/modules/marketing_automation/marketing_automation.py
index f66cef3fe6..16339816c9 100644
--- a/modules/marketing_automation/marketing_automation.py
+++ b/modules/marketing_automation/marketing_automation.py
@@ -25,7 +25,7 @@ from trytond.model import (
     fields)
 from trytond.pool import Pool
 from trytond.pyson import Eval, If, PYSONDecoder, TimeDelta
-from trytond.report import Report, html_to_text
+from trytond.report import Report, html_to_text, mjml_to_html
 from trytond.sendmail import SMTPDataManager, send_message_transactional
 from trytond.tools import grouped_slice, pairwise_longest, reduce_ids
 from trytond.tools.chart import sparkline
@@ -716,6 +716,9 @@ class Activity(
                     activity=self.rec_name,
                     exception=exception)) from exception
 
+        if content.startswith('<mjml'):
+            content = mjml_to_html(content)
+
         msg = self._email(translated.email_from, to, title, content)
 
         if has_rcpt(msg):
diff --git a/modules/marketing_email/CHANGELOG b/modules/marketing_email/CHANGELOG
index 6bfd71cc95..a875a292a0 100644
--- a/modules/marketing_email/CHANGELOG
+++ b/modules/marketing_email/CHANGELOG
@@ -1,3 +1,4 @@
+* Support MJML syntax for email
 
 Version 7.8.0 - 2025-12-15
 --------------------------
diff --git a/modules/marketing_email/marketing.py b/modules/marketing_email/marketing.py
index 28cc93086c..ff7b16d3f3 100644
--- a/modules/marketing_email/marketing.py
+++ b/modules/marketing_email/marketing.py
@@ -21,7 +21,7 @@ from trytond.model import (
     DeactivableMixin, Index, ModelSQL, ModelView, Unique, Workflow, fields)
 from trytond.pool import Pool
 from trytond.pyson import Eval
-from trytond.report import Report, get_email, html_to_text
+from trytond.report import Report, get_email, html_to_text, mjml_to_html
 from trytond.sendmail import SMTPDataManager, send_message_transactional
 from trytond.tools import grouped_slice, reduce_ids
 from trytond.tools.email_ import (
@@ -489,6 +489,9 @@ class Message(Workflow, ModelSQL, ModelView):
                     .filter(convert_href(message))
                     .render())
 
+                if content.startswith('<mjml'):
+                    content = mjml_to_html(content)
+
                 name = email.party.rec_name if email.party else ''
                 from_cfg = (config.get('marketing', 'email_from')
                     or config.get('email', 'from'))