Sending a large number of emails is not an easy task. It can take a lot of time so you need to do it asynchronously. Also, if you are on a shared hosting, you might be limited to a certain number of emails per hour, so you need to divide your list of email addresses in batches and send them at certain intervals.
There’s a plugin that can help us with this: ar_mailer.
This plugin adds a new deliver method to ActionMailer::Base :activerecord. In this delivery method, emails are not actually delivered, they are stored into a database table. A ruby script ar_sendmail can then be run (in a cron job) in order to send the emails saved in the database.
Step by step intructions on how to use the plugin:
1) Install the plugin
./script/plugin install git://github.com/adzap/ar_mailer.git
Add following line to config/environment.rb:
config.gem "adzap-ar_mailer",
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