diff --git a/Gemfile b/Gemfile
index 60919ca63b1..163e0671d78 100644
--- a/Gemfile
+++ b/Gemfile
@@ -80,6 +80,8 @@ else
 end
 gem 'rails-observers'
 
+gem 'mail', '~> 2.5.4'
+
 #gem 'redis-rails'
 gem 'hiredis'
 gem 'redis', require:  ["redis", "redis/connection/hiredis"]
diff --git a/Gemfile.lock b/Gemfile.lock
index 485301a2e19..83d6b3de7b8 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -436,6 +436,7 @@ DEPENDENCIES
   listen (= 0.7.3)
   logster
   lru_redux
+  mail (~> 2.5.4)
   memory_profiler
   message_bus
   minitest