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# install `mail` gem first: `gem install mail`

require 'mail'

Mail.defaults do
  delivery_method :smtp, {
    :port      => 25,
    :address   => "smtpdm.aliyun.com",
    :user_name => "domaintest@dm.aliyun.com",
    :password  => "****",
    :enable_starttls_auto => false, 
    :openssl_verify_mode => 'none',
  }
end

mail = Mail.deliver do
  to      'test@test.com'
  from    'domaintest@dm.aliyun.com'
  subject 'Hello'
  text_part do
    body 'Testing mail'
  end
end