diff --git a/src/email_server/services/MessageService.js b/src/email_server/services/MessageService.js
index 4b25e26..acd4872 100644
--- a/src/email_server/services/MessageService.js
+++ b/src/email_server/services/MessageService.js
@@ -36,6 +36,10 @@ class MessageService {
       throw new Error("Temporary email not authorized");
     }
 
+    if (await this.isValidDomain(messageData.to)) {
+      throw new Error("Receiving to temporary email addresses is not allowed");
+    }
+
     return Message.query().insert({
       ...messageData,
       temp_email_id: tempEmail.id,