diff --git a/backend/inspirehep/mailing/providers/mailtrain.py b/backend/inspirehep/mailing/providers/mailtrain.py
index ee70ca66cb..db417eced2 100644
--- a/backend/inspirehep/mailing/providers/mailtrain.py
+++ b/backend/inspirehep/mailing/providers/mailtrain.py
@@ -23,7 +23,12 @@ def mailtrain_subscribe_user_to_list(list_id, email, first_name, last_name):
         last_name (str): user last name.
     """
     LOGGER.info("Adding user to the mailing list.", list_id=list_id, email=email)
-    data = {"FIRST_NAME": first_name, "LAST_NAME": last_name, "EMAIL": email}
+    data = {
+        "FIRST_NAME": first_name,
+        "LAST_NAME": last_name,
+        "EMAIL": email,
+        "FORCE_SUBSCRIBE": "yes",
+    }
     response = requests.post(
         f"{current_app.config.get('MAILTRAIN_URL')}/api/subscribe/{list_id}",
         params={"access_token": current_app.config.get("MAILTRAIN_API_TOKEN")},
diff --git a/backend/tests/integration/mailing/cassettes/test_mailtrain_subscribe_user_to_list.yaml b/backend/tests/integration/mailing/cassettes/test_mailtrain_subscribe_user_to_list.yaml
index f9e361261e..ba9e9b8246 100644
--- a/backend/tests/integration/mailing/cassettes/test_mailtrain_subscribe_user_to_list.yaml
+++ b/backend/tests/integration/mailing/cassettes/test_mailtrain_subscribe_user_to_list.yaml
@@ -1,6 +1,6 @@
 interactions:
 - request:
-    body: FIRST_NAME=Firstname&LAST_NAME=Lastname&EMAIL=test%40email.ch
+    body: FIRST_NAME=Firstname&LAST_NAME=Lastname&EMAIL=test%40email.ch&FORCE_SUBSCRIBE=yes
     headers:
       Accept:
       - '*/*'
@@ -9,7 +9,7 @@ interactions:
       Connection:
       - keep-alive
       Content-Length:
-      - '61'
+      - '81'
       Content-Type:
       - application/x-www-form-urlencoded
       User-Agent: