From 25602972abed0213c7c83cbb34eea89fd5260f03 Mon Sep 17 00:00:00 2001
From: Sebastian Serth <Sebastian.Serth@student.hpi.de>
Date: Wed, 12 Dec 2018 14:11:57 +0100
Subject: [PATCH] Prevent delivery of mails to non-existent empty mail
 addresses

---
 app/mailers/user_mailer.rb | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/app/mailers/user_mailer.rb b/app/mailers/user_mailer.rb
index 497c2a31..b7b3d52f 100644
--- a/app/mailers/user_mailer.rb
+++ b/app/mailers/user_mailer.rb
@@ -1,4 +1,10 @@
 class UserMailer < ActionMailer::Base
+
+  def mail(*args)
+    # used to prevent the delivery to pseudonymous users without a valid email address
+    super unless args.first[:to].blank?
+  end
+
   def activation_needed_email(user)
     @activation_url = activate_internal_user_url(user, token: user.activation_token)
     mail(subject: t('mailers.user_mailer.activation_needed.subject'), to: user.email)