diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9a3332f..000d325 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,10 @@ and this project adheres to
 
 ## [Unreleased]
 
+### Added
+
+- ✨(domains) add support email field on domain
+
 ## [1.11.0] - 2025-02-07
 
 ### Added
diff --git a/src/backend/mailbox_manager/api/client/serializers.py b/src/backend/mailbox_manager/api/client/serializers.py
index 4eaf5c4..2a88eb8 100644
--- a/src/backend/mailbox_manager/api/client/serializers.py
+++ b/src/backend/mailbox_manager/api/client/serializers.py
@@ -70,6 +70,7 @@ class MailDomainSerializer(serializers.ModelSerializer):
             "created_at",
             "updated_at",
             "count_mailboxes",
+            "support_email",
         ]
         read_only_fields = [
             "id",
diff --git a/src/backend/mailbox_manager/api/client/viewsets.py b/src/backend/mailbox_manager/api/client/viewsets.py
index 9514bba..5c14117 100644
--- a/src/backend/mailbox_manager/api/client/viewsets.py
+++ b/src/backend/mailbox_manager/api/client/viewsets.py
@@ -33,6 +33,7 @@ class MailDomainViewSet(
 
     POST /api/<version>/mail-domains/ with expected data:
         - name: str
+        - support_email: str
         Return newly created domain
     """
 
diff --git a/src/backend/mailbox_manager/factories.py b/src/backend/mailbox_manager/factories.py
index 51f7eda..d04bd28 100644
--- a/src/backend/mailbox_manager/factories.py
+++ b/src/backend/mailbox_manager/factories.py
@@ -27,6 +27,7 @@ class MailDomainFactory(factory.django.DjangoModelFactory):
 
     name = factory.Faker("domain_name")
     slug = factory.LazyAttribute(lambda o: slugify(o.name))
+    support_email = factory.Faker("email")
 
     @factory.post_generation
     def users(self, create, extracted, **kwargs):
diff --git a/src/backend/mailbox_manager/management/commands/setup_dimail_db.py b/src/backend/mailbox_manager/management/commands/setup_dimail_db.py
index 34653ef..3118c22 100644
--- a/src/backend/mailbox_manager/management/commands/setup_dimail_db.py
+++ b/src/backend/mailbox_manager/management/commands/setup_dimail_db.py
@@ -66,7 +66,11 @@ class Command(BaseCommand):
         # we create a domain and add John Doe to it
         domain_name = "test.domain.com"
         domain = MailDomain.objects.get_or_create(
-            name=domain_name, defaults={"status": enums.MailDomainStatusChoices.ENABLED}
+            name=domain_name,
+            defaults={
+                "status": enums.MailDomainStatusChoices.ENABLED,
+                "support_email": f"support@{domain_name}",
+            },
         )[0]
         self.create_domain(domain_name)
 
diff --git a/src/backend/mailbox_manager/migrations/0018_maildomain_support_email.py b/src/backend/mailbox_manager/migrations/0018_maildomain_support_email.py
new file mode 100644
index 0000000..21a3d59
--- /dev/null
+++ b/src/backend/mailbox_manager/migrations/0018_maildomain_support_email.py
@@ -0,0 +1,31 @@
+# Generated by Django 5.1.5 on 2025-02-02 21:49
+
+from django.db import migrations, models
+
+
+def fill_support_email(apps, schema_editor):
+    MailDomain = apps.get_model('mailbox_manager', 'MailDomain')
+    for domain in MailDomain.objects.filter(support_email__isnull=True):
+        domain.support_email = "support-regie@numerique.gouv.fr"
+        domain.save()
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('mailbox_manager', '0017_alter_maildomain_status'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='maildomain',
+            name='support_email',
+            field=models.EmailField(blank=True, max_length=254, null=True, verbose_name='support email'),
+        ),
+        migrations.RunPython(fill_support_email, reverse_code=migrations.RunPython.noop),
+        migrations.AlterField(
+            model_name='maildomain',
+            name='support_email',
+            field=models.EmailField(max_length=254, verbose_name='support email'),
+        ),
+    ]
diff --git a/src/backend/mailbox_manager/models.py b/src/backend/mailbox_manager/models.py
index f122e31..ca41690 100644
--- a/src/backend/mailbox_manager/models.py
+++ b/src/backend/mailbox_manager/models.py
@@ -29,6 +29,7 @@ class MailDomain(BaseModel):
         default=MailDomainStatusChoices.PENDING,
         choices=MailDomainStatusChoices.choices,
     )
+    support_email = models.EmailField(_("support email"), null=False, blank=False)
 
     class Meta:
         db_table = "people_mail_domain"
diff --git a/src/backend/mailbox_manager/tests/api/mail_domain/test_api_mail_domains_create.py b/src/backend/mailbox_manager/tests/api/mail_domain/test_api_mail_domains_create.py
index 8880fc5..dd000b6 100644
--- a/src/backend/mailbox_manager/tests/api/mail_domain/test_api_mail_domains_create.py
+++ b/src/backend/mailbox_manager/tests/api/mail_domain/test_api_mail_domains_create.py
@@ -99,7 +99,12 @@ def test_api_mail_domains__create_authenticated():
         )
         response = client.post(
             "/api/v1.0/mail-domains/",
-            {"name": domain_name, "context": "null", "features": ["webmail"]},
+            {
+                "name": domain_name,
+                "context": "null",
+                "features": ["webmail"],
+                "support_email": f"support@{domain_name}",
+            },
             format="json",
         )
     assert response.status_code == status.HTTP_201_CREATED
@@ -115,6 +120,7 @@ def test_api_mail_domains__create_authenticated():
         "updated_at": domain.updated_at.isoformat().replace("+00:00", "Z"),
         "abilities": domain.get_abilities(user),
         "count_mailboxes": 0,
+        "support_email": domain.support_email,
     }
 
     # a new domain with status "pending" is created and authenticated user is the owner
@@ -171,10 +177,14 @@ def test_api_mail_domains__create_authenticated__dimail_failure():
         )
         response = client.post(
             "/api/v1.0/mail-domains/",
-            {"name": domain_name, "context": "null", "features": ["webmail"]},
+            {
+                "name": domain_name,
+                "context": "null",
+                "features": ["webmail"],
+                "support_email": f"support@{domain_name}",
+            },
             format="json",
         )
-    assert response.status_code == status.HTTP_201_CREATED
     domain = models.MailDomain.objects.get()
 
     # response is as expected
@@ -187,6 +197,7 @@ def test_api_mail_domains__create_authenticated__dimail_failure():
         "updated_at": domain.updated_at.isoformat().replace("+00:00", "Z"),
         "abilities": domain.get_abilities(user),
         "count_mailboxes": 0,
+        "support_email": domain.support_email,
     }
 
     # a new domain with status "failed" is created and authenticated user is the owner
@@ -244,6 +255,7 @@ def test_api_mail_domains__create_dimail_domain(caplog):
             "/api/v1.0/mail-domains/",
             {
                 "name": domain_name,
+                "support_email": f"support@{domain_name}",
             },
             format="json",
         )
@@ -292,6 +304,7 @@ def test_api_mail_domains__no_creation_when_dimail_duplicate(caplog):
                 "/api/v1.0/mail-domains/",
                 {
                     "name": domain_name,
+                    "support_email": f"support@{domain_name}",
                 },
                 format="json",
             )
diff --git a/src/backend/mailbox_manager/tests/api/mail_domain/test_api_mail_domains_retrieve.py b/src/backend/mailbox_manager/tests/api/mail_domain/test_api_mail_domains_retrieve.py
index 44b68da..65236de 100644
--- a/src/backend/mailbox_manager/tests/api/mail_domain/test_api_mail_domains_retrieve.py
+++ b/src/backend/mailbox_manager/tests/api/mail_domain/test_api_mail_domains_retrieve.py
@@ -87,4 +87,5 @@ def test_api_mail_domains__retrieve_authenticated_related():
         "updated_at": domain.updated_at.isoformat().replace("+00:00", "Z"),
         "abilities": domain.get_abilities(user),
         "count_mailboxes": 10,
+        "support_email": domain.support_email,
     }