ar_mailer is a two-phase delivery agent for ActionMailer. Even delivering email to the local machine may take too long when you have to send hundreds of messages. ar_mailer allows you to store messages into the database for later delivery by a separate process, ar_sendmail.
Gemfile gem 'ar_mailer', '~> 1.3.2'
install gem install ar_mailer -v 1.3.2