A simple Ruby script to send mass emails

mailer.rb

require 'mail'
require 'csv'
FILE = ARGV[0]

Mail.defaults do
  delivery_method :smtp, {
    address: '',
    port: 587,
    domain: '',
    user_name: '',
    password: ENV.fetch('EMAIL_PASSWORD'),
    authentication: :plain,
    enable_starttls_auto: true
  }
end


def send_email(address)
  mail = Mail.new do
    to      address
    from    'Example <email@example.com>'
    subject ''
    body    generate_body
  end
end

def generate_body
  %Q( 
Dear User,

...
  )
end


CSV.parse(File.read(FILE)).each do |line|
  address = line[0]
  m = send_email(address)
  puts m.to_s
  p m.deliver!

  puts
  puts
end