diff --git a/app/api/views/custom_domain.py b/app/api/views/custom_domain.py
index d7a73a86..9e08d9ef 100644
--- a/app/api/views/custom_domain.py
+++ b/app/api/views/custom_domain.py
@@ -27,7 +27,9 @@ def custom_domain_to_dict(custom_domain: CustomDomain):
 @require_api_auth
 def get_custom_domains():
     user = g.user
-    custom_domains = CustomDomain.filter_by(user_id=user.id).all()
+    custom_domains = CustomDomain.filter_by(
+        user_id=user.id, is_sl_subdomain=False
+    ).all()
 
     return jsonify(custom_domains=[custom_domain_to_dict(cd) for cd in custom_domains])
 
diff --git a/app/dashboard/views/custom_domain.py b/app/dashboard/views/custom_domain.py
index 0ef4540d..620d2fa1 100644
--- a/app/dashboard/views/custom_domain.py
+++ b/app/dashboard/views/custom_domain.py
@@ -19,7 +19,9 @@ class NewCustomDomainForm(FlaskForm):
 @dashboard_bp.route("/custom_domain", methods=["GET", "POST"])
 @login_required
 def custom_domain():
-    custom_domains = CustomDomain.filter_by(user_id=current_user.id).all()
+    custom_domains = CustomDomain.filter_by(
+        user_id=current_user.id, is_sl_subdomain=False
+    ).all()
     mailboxes = current_user.mailboxes()
     new_custom_domain_form = NewCustomDomainForm()