diff --git a/CHANGELOG.md b/CHANGELOG.md
index a0f6d44..f7da7f9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,10 @@ and this project adheres to
 - ✨(frontend) feature modal add new access role to domain 
 - ✨(api) allow invitations for domain management #708
 
+### Fixed
+
+- 🐛(mailbox) fix mailbox creation email language
+
 ## [1.13.1] - 2025-03-04
 
 ### Fixed
diff --git a/src/backend/mailbox_manager/api/client/serializers.py b/src/backend/mailbox_manager/api/client/serializers.py
index 2f12ec6..e224cf1 100644
--- a/src/backend/mailbox_manager/api/client/serializers.py
+++ b/src/backend/mailbox_manager/api/client/serializers.py
@@ -55,7 +55,9 @@ class MailboxSerializer(serializers.ModelSerializer):
 
             # send confirmation email
             client.notify_mailbox_creation(
-                recipient=mailbox.secondary_email, mailbox_data=response.json()
+                recipient=mailbox.secondary_email,
+                mailbox_data=response.json(),
+                issuer=self.context["request"].user,
             )
 
         # actually save mailbox on our database
diff --git a/src/backend/mailbox_manager/tests/api/mailboxes/test_api_mailboxes_create.py b/src/backend/mailbox_manager/tests/api/mailboxes/test_api_mailboxes_create.py
index 2a24d1c..9863228 100644
--- a/src/backend/mailbox_manager/tests/api/mailboxes/test_api_mailboxes_create.py
+++ b/src/backend/mailbox_manager/tests/api/mailboxes/test_api_mailboxes_create.py
@@ -790,10 +790,14 @@ def test_api_mailboxes__sends_new_mailbox_notification(mock_info):
     Creating a new mailbox should send confirmation email
     to secondary email.
     """
-    access = factories.MailDomainAccessFactory(role=enums.MailDomainRoleChoices.OWNER)
+    user = core_factories.UserFactory(language="fr-fr")
+    access = factories.MailDomainAccessFactory(
+        user=user,
+        role=enums.MailDomainRoleChoices.OWNER,
+    )
 
     client = APIClient()
-    client.force_login(access.user)
+    client.force_login(user)
     mailbox_data = serializers.MailboxSerializer(
         factories.MailboxFactory.build(domain=access.domain)
     ).data
@@ -824,7 +828,10 @@ def test_api_mailboxes__sends_new_mailbox_notification(mock_info):
             )
 
         assert mock_send.call_count == 1
-        assert mock_send.mock_calls[0][1][0] == "Your new mailbox information"
+        assert (
+            "Informations sur votre nouvelle boîte mail"
+            in mock_send.mock_calls[0][1][1]
+        )
         assert mock_send.mock_calls[0][1][3][0] == mailbox_data["secondary_email"]
 
     expected_messages = {
diff --git a/src/backend/mailbox_manager/utils/dimail.py b/src/backend/mailbox_manager/utils/dimail.py
index 90387ec..fbe85ab 100644
--- a/src/backend/mailbox_manager/utils/dimail.py
+++ b/src/backend/mailbox_manager/utils/dimail.py
@@ -13,6 +13,7 @@ from django.contrib.sites.models import Site
 from django.core import exceptions, mail
 from django.template.loader import render_to_string
 from django.utils.translation import gettext_lazy as _
+from django.utils.translation import override
 
 import requests
 from rest_framework import status
@@ -258,31 +259,29 @@ class DimailAPIClient:
             f"{error_content.get('detail') or error_content}"
         )
 
-    def notify_mailbox_creation(self, recipient, mailbox_data):
+    def notify_mailbox_creation(self, recipient, mailbox_data, issuer=None):
         """
         Send email to confirm mailbox creation
         and send new mailbox information.
         """
-
-        template_vars = {
-            "title": _("Your new mailbox information"),
-            "site": Site.objects.get_current(),
-            "webmail_url": settings.WEBMAIL_URL,
-            "mailbox_data": mailbox_data,
-        }
-
-        msg_html = render_to_string("mail/html/new_mailbox.html", template_vars)
-        msg_plain = render_to_string("mail/text/new_mailbox.txt", template_vars)
-
         try:
-            mail.send_mail(
-                template_vars["title"],
-                msg_plain,
-                settings.EMAIL_FROM,
-                [recipient],
-                html_message=msg_html,
-                fail_silently=False,
-            )
+            with override(issuer.language if issuer else settings.LANGUAGE_CODE):
+                template_vars = {
+                    "title": _("Your new mailbox information"),
+                    "site": Site.objects.get_current(),
+                    "webmail_url": settings.WEBMAIL_URL,
+                    "mailbox_data": mailbox_data,
+                }
+                msg_html = render_to_string("mail/html/new_mailbox.html", template_vars)
+                msg_plain = render_to_string("mail/text/new_mailbox.txt", template_vars)
+                mail.send_mail(
+                    template_vars["title"],
+                    msg_plain,
+                    settings.EMAIL_FROM,
+                    [recipient],
+                    html_message=msg_html,
+                    fail_silently=False,
+                )
             logger.info(
                 "Information for mailbox %s sent to %s.",
                 mailbox_data["email"],
diff --git a/src/backend/people/settings.py b/src/backend/people/settings.py
index fd96c62..5906d90 100755
--- a/src/backend/people/settings.py
+++ b/src/backend/people/settings.py
@@ -136,7 +136,11 @@ class Base(Configuration):
     # https://docs.djangoproject.com/en/3.1/topics/i18n/
 
     # Languages
-    LANGUAGE_CODE = values.Value("en-us")
+    LANGUAGE_CODE = values.Value(
+        default="en-us",
+        environ_name="LANGUAGE_CODE",
+        environ_prefix=None,
+    )
 
     DRF_NESTED_MULTIPART_PARSER = {
         # output of parser is converted to querydict