diff --git a/src/openforms/emails/constants.py b/src/openforms/emails/constants.py
index 6db2a3cbb2..b61025ed71 100644
--- a/src/openforms/emails/constants.py
+++ b/src/openforms/emails/constants.py
@@ -9,8 +9,8 @@
 class EmailEventChoices(models.TextChoices):
     registration = "registration", _("Registration")
     confirmation = "confirmation", _("Confirmation")
-    cosign_confirmation = "cosign_confirmation", _("Co-sign confirmation")
+    cosign_request = "cosign_request", _("Co-sign request")
 
 
 class EmailContentTypeChoices(models.TextChoices):
-    submission = "submission.submission", _("Submission")
+    submission = "submissions.Submission", _("Submission")
diff --git a/src/openforms/submissions/tasks/emails.py b/src/openforms/submissions/tasks/emails.py
index 4fb4665392..5e9bfbc812 100644
--- a/src/openforms/submissions/tasks/emails.py
+++ b/src/openforms/submissions/tasks/emails.py
@@ -10,6 +10,13 @@
 
 from openforms.celery import app
 from openforms.config.models import GlobalConfiguration
+from openforms.emails.constants import (
+    X_OF_CONTENT_TYPE_HEADER,
+    X_OF_CONTENT_UUID_HEADER,
+    X_OF_EVENT_HEADER,
+    EmailContentTypeChoices,
+    EmailEventChoices,
+)
 from openforms.emails.utils import send_mail_html
 from openforms.frontend import get_frontend_redirect_url
 from openforms.logging import logevent
@@ -133,6 +140,12 @@ def send_email_cosigner(submission_id: int) -> None:
                 from_email=settings.DEFAULT_FROM_EMAIL,
                 recipient_list=[recipient],
                 text_message=content,
+                extra_headers={
+                    "Content-Language": submission.language_code,
+                    X_OF_CONTENT_TYPE_HEADER: EmailContentTypeChoices.submission,
+                    X_OF_CONTENT_UUID_HEADER: str(submission.uuid),
+                    X_OF_EVENT_HEADER: EmailEventChoices.cosign_request,
+                },
             )
         except Exception:
             logevent.cosigner_email_queuing_failure(submission)
diff --git a/src/openforms/submissions/tests/test_task_co_sign.py b/src/openforms/submissions/tests/test_task_co_sign.py
index c7e81c0e13..a76ac10f8c 100644
--- a/src/openforms/submissions/tests/test_task_co_sign.py
+++ b/src/openforms/submissions/tests/test_task_co_sign.py
@@ -4,6 +4,7 @@
 from django.test import TestCase
 
 from openforms.config.models import GlobalConfiguration
+from openforms.emails.constants import EmailContentTypeChoices, EmailEventChoices
 from openforms.logging.models import TimelineLogProxy
 
 from ..tasks import send_email_cosigner
@@ -175,3 +176,34 @@ def test_form_link_not_allowed_in_email(self):
 
         self.assertNotIn(form_link, email.body)
         self.assertIn(submission.public_registration_reference, email.body)
+
+    def test_headers_in_cosign_request_email(self):
+        submission = SubmissionFactory.from_components(
+            components_list=[
+                {
+                    "key": "cosign",
+                    "type": "cosign",
+                    "label": "Cosign component",
+                },
+            ],
+            submitted_data={"cosign": "test@test.nl"},
+            form_url="http://testserver/myform/",
+        )
+        send_email_cosigner(submission.id)
+
+        self.assertEqual(len(mail.outbox), 1)
+        message = mail.outbox[0]
+
+        # UUID is not a constant, so just test if it exists
+        submission_uuid = message.extra_headers.pop("X-OF-Content-UUID", None)
+        self.assertIsNotNone(submission_uuid)
+
+        # Test remaining headers
+        self.assertEqual(
+            message.extra_headers,
+            {
+                "Content-Language": "nl",
+                "X-OF-Content-Type": EmailContentTypeChoices.submission,
+                "X-OF-Event": EmailEventChoices.cosign_request,
+            },
+        )
diff --git a/src/openforms/submissions/tests/test_tasks_confirmation_emails.py b/src/openforms/submissions/tests/test_tasks_confirmation_emails.py
index 2194501216..52256d918e 100644
--- a/src/openforms/submissions/tests/test_tasks_confirmation_emails.py
+++ b/src/openforms/submissions/tests/test_tasks_confirmation_emails.py
@@ -11,6 +11,7 @@
 from privates.test import temp_private_root
 
 from openforms.config.models import GlobalConfiguration
+from openforms.emails.constants import EmailContentTypeChoices, EmailEventChoices
 from openforms.emails.models import ConfirmationEmailTemplate
 from openforms.emails.tests.factories import ConfirmationEmailTemplateFactory
 from openforms.forms.tests.factories import FormStepFactory
@@ -641,6 +642,37 @@ def test_template_is_rendered_in_submission_language(self):
         self.assertIn("Translated Radio option 1", html_message)
         self.assertIn("Translated Select option 2", html_message)
 
+    def test_headers_present_in_confirmation_email(self):
+        submission = SubmissionFactory.from_components(
+            completed=True,
+            components_list=[
+                {
+                    "key": "email",
+                    "confirmationRecipient": True,
+                },
+            ],
+            submitted_data={"email": "test@test.nl"},
+        )
+        with override_settings(CELERY_TASK_ALWAYS_EAGER=True):
+            send_confirmation_email(submission.id)
+
+        self.assertEqual(len(mail.outbox), 1)
+        message = mail.outbox[0]
+
+        # UUID is not a constant, so just test if it exists
+        submission_uuid = message.extra_headers.pop("X-OF-Content-UUID", None)
+        self.assertIsNotNone(submission_uuid)
+
+        # Test remaining headers
+        self.assertEqual(
+            message.extra_headers,
+            {
+                "Content-Language": "nl",
+                "X-OF-Content-Type": EmailContentTypeChoices.submission,
+                "X-OF-Event": EmailEventChoices.confirmation,
+            },
+        )
+
 
 class RaceConditionTests(TransactionTestCase):
     @patch("openforms.submissions.tasks.emails._send_confirmation_email")
diff --git a/src/openforms/submissions/utils.py b/src/openforms/submissions/utils.py
index 762b5f036a..faba1b0a67 100644
--- a/src/openforms/submissions/utils.py
+++ b/src/openforms/submissions/utils.py
@@ -19,6 +19,13 @@
     get_confirmation_email_context_data,
     get_confirmation_email_templates,
 )
+from openforms.emails.constants import (
+    X_OF_CONTENT_TYPE_HEADER,
+    X_OF_CONTENT_UUID_HEADER,
+    X_OF_EVENT_HEADER,
+    EmailContentTypeChoices,
+    EmailEventChoices,
+)
 from openforms.emails.utils import (
     render_email_template,
     send_mail_html,
@@ -204,6 +211,12 @@ def send_confirmation_email(submission: Submission) -> None:
             cc=cc_emails,
             text_message=text_content,
             theme=submission.form.theme,
+            extra_headers={
+                "Content-Language": submission.language_code,
+                X_OF_CONTENT_TYPE_HEADER: EmailContentTypeChoices.submission,
+                X_OF_CONTENT_UUID_HEADER: str(submission.uuid),
+                X_OF_EVENT_HEADER: EmailEventChoices.confirmation,
+            },
         )
     except Exception as e:
         logevent.confirmation_email_failure(submission, e)