diff --git a/app/controllers/admin/email_controller.rb b/app/controllers/admin/email_controller.rb
index b165827f4d..257c58061b 100644
--- a/app/controllers/admin/email_controller.rb
+++ b/app/controllers/admin/email_controller.rb
@@ -117,10 +117,9 @@ class Admin::EmailController < Admin::AdminController
   end
 
   def smtp_should_reject
-    params.require(:from)
     params.require(:to)
     # These strings aren't localized; they are sent to an anonymous SMTP user.
-    if !User.with_email(Email.downcase(params[:from])).exists? && !SiteSetting.enable_staged_users
+    if params[:from].present? && !User.with_email(Email.downcase(params[:from])).exists? && !SiteSetting.enable_staged_users
       render json: {
                reject: true,
                reason: "Mail from your address is not accepted. Do you have an account here?",