diff --git a/src/openapi/customers/SE-notifications.yaml b/src/openapi/customers/SE-notifications.yaml
index d4cb937..ef9d597 100644
--- a/src/openapi/customers/SE-notifications.yaml
+++ b/src/openapi/customers/SE-notifications.yaml
@@ -264,7 +264,8 @@ paths:
         - name: emailAddress
           in: query
           schema:
-            type: integer
+            type: string
+            format: email
             example: john.doe@mymailprovider.com
           required: false
           description: The emailadress of the customer in the case of anonymous opt-ins