diff --git a/selfprivacy_api/services/roundcube/__init__.py b/selfprivacy_api/services/roundcube/__init__.py
index 9a52c3a..b61282b 100644
--- a/selfprivacy_api/services/roundcube/__init__.py
+++ b/selfprivacy_api/services/roundcube/__init__.py
@@ -44,6 +44,14 @@ class Roundcube(Service):
         subdomain = get_subdomain()
         return f"https://{subdomain}.{domain}"
 
+    @staticmethod
+    def get_subdomain() -> Optional[str]:
+        with ReadUserData() as data:
+            if "roundcube" in data["modules"]:
+                return data["modules"]["roundcube"]["subdomain"]
+
+        return "webmail"
+
     @staticmethod
     def is_movable() -> bool:
         return False
diff --git a/selfprivacy_api/services/service.py b/selfprivacy_api/services/service.py
index 262d690..64a1e80 100644
--- a/selfprivacy_api/services/service.py
+++ b/selfprivacy_api/services/service.py
@@ -1,5 +1,4 @@
 """Abstract class for a service running on a server"""
-
 from abc import ABC, abstractmethod
 from typing import List, Optional
 
@@ -74,14 +73,13 @@ class Service(ABC):
         """
         pass
 
+    @staticmethod
+    @abstractmethod
     def get_subdomain() -> Optional[str]:
         """
         The assigned primary subdomain for this service.
         """
-        with ReadUserData() as data:
-            if self.get_display_name() in data["modules"]:
-                if "subdomain" in data["modules"][self.get_display_name()]:
-                    return data["modules"][self.get_display_name()]["subdomain"]
+        pass
 
     @classmethod
     def get_user(cls) -> Optional[str]: