diff --git a/Gemfile.lock b/Gemfile.lock
index d94ae4242..f60d15f15 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -553,7 +553,7 @@ DEPENDENCIES
   rails (= 4.2.11)
   rails-assets-leaflet!
   rails-assets-markdown-it (~> 8.2.1)!
-  recipient_interceptor
+  recipient_interceptor (~> 0.2.0)
   redcarpet (~> 3.4.0)
   responders (~> 2.4.0)
   rinku (~> 2.0.2)
diff --git a/config/initializers/recipient_interceptor.rb b/config/initializers/recipient_interceptor.rb
index 79b228642..6a5cce20e 100644
--- a/config/initializers/recipient_interceptor.rb
+++ b/config/initializers/recipient_interceptor.rb
@@ -1,6 +1,6 @@
 recipients = Rails.application.secrets.email_interceptor_recipients
 
 if recipients.present?
-  interceptor = RecipientInterceptor.new(recipients)
+  interceptor = RecipientInterceptor.new(recipients, subject_prefix: "[#{Rails.env}]")
   Mail.register_interceptor(interceptor)
 end