diff --git a/README.md b/README.md
index cc05206..45a9aa7 100644
--- a/README.md
+++ b/README.md
@@ -24,12 +24,13 @@ The re2o section defines parameter to connect to re2o api.
 
 ### Mailman section
 
-| Parameter  | Description              | Default value    |
-|------------|--------------------------|------------------|
-| `url`      | url for mailman api      | `localhost:8001` |
-| `username` | username for mailman api | `restadmin`      |
-| `password` | password for mailman api | `restpassword`   |
-| `domain`   | domain for mailing lists | `example.net`    |
+| Parameter    | Description                               | Default value                                                                                      |
+|--------------|-------------------------------------------|----------------------------------------------------------------------------------------------------|
+| `url`        | url for mailman api                       | `localhost:8001`                                                                                   |
+| `username`   | username for mailman api                  | `restadmin`                                                                                        |
+| `password`   | password for mailman api                  | `restpassword`                                                                                     |
+| `domain`     | domain for mailing lists                  | `example.net`                                                                                      |
+| `roster_url` | roster url for getting and deleting email | None (`http://{mailman_url}/3.1/lists/{list_name}@{domain}/roster/member` will be used by default) |
 
 ### Sections for mailing-lists
 
diff --git a/sync_adherents_mailman.py b/sync_adherents_mailman.py
index b945a5d..5af986b 100644
--- a/sync_adherents_mailman.py
+++ b/sync_adherents_mailman.py
@@ -13,14 +13,14 @@ mailman_url = config.get('Mailman', 'url')
 mailman_username = config.get('Mailman', 'username')
 mailman_password = config.get('Mailman', 'password')
 domain = config.get('Mailman', 'domain')
-
+roster_url = config.get('Mailman', 'roster_url', fallback='http://{mailman_url}/3.1/lists/{list_name}@{domain}/roster/member')
 changed = int(open(filename).read())
 
 if changed:
     for section in config.sections():
         if section not in ["Re2o", "Mailman"] and config.getboolean(section, 'activate'):
             list_name = config.get(section, "list_name", fallback=section)
-            response1 = requests.get('http://{}/3.1/lists/{}@{}/roster/member'.format(mailman_url, list_name, domain), auth=(mailman_username, mailman_password))
+            response1 = requests.get(roster_url.format(mailman_url=mailman_url, list_namelist_name, domain=domain), auth=(mailman_username, mailman_password))
             if "entries" in response1.json():
                 entries = response1.json()['entries']
                 old_emails = [entry['email'] for entry in entries]
@@ -28,7 +28,7 @@ if changed:
                 emails_to_delete = [email for email in old_emails if email not in new_emails]
                 if emails_to_delete:
                     print("[..] Deleting non members from list {}".format(list_name))
-                    response = requests.delete('http://{}/3.1/lists/{}@{}/roster/member'.format(mailman_url, list_name, domain), auth=(mailman_username,mailman_password), params={'emails': emails_to_delete})
+                    response = requests.delete(roster_url.format(mailman_url=mailman_url, list_name=list_name, domain=domain), auth=(mailman_username,mailman_password), params={'emails': emails_to_delete})
                     print("[OK] Non members where deleted from list {}".format(list_name))
                 else:
                     print("[INFO] No member to delete for list {}".format(list_name))