Rail setup mail example

ActionMailer::Base.smtp_settings = {
  :address                    => "smtp.gmail.com",
  :port                           => 587,
  :domain                      => "gmail.com",
  :user_name                => "user_name", #Your user name
  :password                   => 'pass', # Your password
  :authentication           => "plain",
  :enable_starttls_auto => true
}
 ActionMailer::Base.default_url_options[:host] = "localhost:3000" 
 ActionMailer::Base.default_url_options[:only_path] = false