diff --git a/src/methods/account_update.rs b/src/methods/account_update.rs
index 8733210..6ec2bac 100644
--- a/src/methods/account_update.rs
+++ b/src/methods/account_update.rs
@@ -22,6 +22,11 @@ pub async fn post_update_ldap(mut req: Request<State>) -> tide::Result {
         value,
     } = req.body_json().await?;
 
+    // check that any mail is not using @skynet.ie
+    if field == "mail" && value.trim().ends_with("@skynet.ie") {
+        return Ok(json!({"result": "error", "error": "skynet email not valid contact address"}).into());
+    }
+
     let config = &req.state().config;
 
     // easier to give each request its own connection