How to configure to send email through localhost app server without authentication?

Question

I have configured the Rails mailer under config/initializers/ like following:

/config/initializers/setup_email.rb

config.action_mailer.raise_delivery_errors = true

  ActionMailer::Base.smtp_settings = {
   :address => "smtp.gmail.com",
   :port => 587,
   :domain => 'gmail.com',
   :authentication => :plain,
   :user_name=><username>,
   :password=><password>,
   :enable_starttls_auto => true
}

it works fine, I can send emails and get them received.

But how to configure it to send email from localhost without authentication(without username and password), that's do not use gmail, but send email through the application's local server, how to configure then?

--EDIT--- When using localhost, the error message I got is:

Connection refused - connect(2)
/home/user1/.rvm/rubies/ruby-1.8.7-p330/lib/ruby/1.8/net/smtp.rb:551:in `initialize'
/home/user1/.rvm/rubies/ruby-1.8.7-p330/lib/ruby/1.8/net/smtp.rb:551:in `open'
/home/user1/.rvm/rubies/ruby-1.8.7-p330/lib/ruby/1.8/net/smtp.rb:551:in `do_start'
/home/user1/.rvm/rubies/ruby-1.8.7-p330/lib/ruby/1.8/timeout.rb:67:in `timeout'
/home/user1/.rvm/rubies/ruby-1.8.7-p330/lib/ruby/1.8/timeout.rb:101:in `timeout'
/home/user1/.rvm/rubies/ruby-1.8.7-p330/lib/ruby/1.8/net/smtp.rb:551:in `do_start'
/home/user1/.rvm/rubies/ruby-1.8.7-p330/lib/ruby/1.8/net/smtp.rb:525:in `start'
/home/user1/.rvm/gems/ruby-1.8.7-p330@myapp/gems/mail-2.2.15/lib/mail/network/delivery_methods/smtp.rb:127:in `deliver!'
/home/user1/.rvm/gems/ruby-1.8.7-p330@myapp/gems/mail-2.2.15/lib/mail/message.rb:1967:in `do_delivery'
/home/user1/.rvm/gems/ruby-1.8.7-p330@myapp/gems/mail-2.2.15/lib/mail/message.rb:228:in `deliver'
/home/user1/.rvm/gems/ruby-1.8.7-p330@global/gems/actionmailer-3.0.3/lib/action_mailer/base.rb:401:in `deliver_mail'
/home/user1/.rvm/gems/ruby-1.8.7-p330@global/gems/activesupport-3.0.3/lib/active_support/messages.rb:52:in `instrument'
/home/user1/.rvm/gems/ruby-1.8.7-p330@global/gems/activesupport-3.0.3/lib/active_support/messages/instrumenter.rb:21:in `instrument'
/home/user1/.rvm/gems/ruby-1.8.7-p330@global/gems/activesupport-3.0.3/lib/active_support/messages.rb:52:in `instrument'
/home/user1/.rvm/gems/ruby-1.8.7-p330@global/gems/actionmailer-3.0.3/lib/action_mailer/base.rb:399:in `deliver_mail'
/home/user1/.rvm/gems/ruby-1.8.7-p330@myapp/gems/mail-2.2.15/lib/mail/message.rb:228:in `deliver'
/home/user1/myapp/app/mailers/my_mailer.rb:9:in `new_car_messages'
/home/user1/.rvm/gems/ruby-1.8.7-p330@global/gems/actionpack-3.0.3/lib/abstract_controller/base.rb:151:in `send_action'
/home/user1/.rvm/gems/ruby-1.8.7-p330@global/gems/actionpack-3.0.3/lib/abstract_controller/base.rb:151:in `process_action'
/home/user1/.rvm/gems/ruby-1.8.7-p330@global/gems/actionpack-3.0.3/lib/abstract_controller/base.rb:120:in `process'
/home/user1/.rvm/gems/ruby-1.8.7-p330@global/gems/actionpack-3.0.3/lib/abstract_controller/rendering.rb:40:in `process'
/home/user1/.rvm/gems/ruby-1.8.7-p330@global/gems/actionmailer-3.0.3/lib/action_mailer/old_api.rb:75:in `process'
/home/user1/.rvm/gems/ruby-1.8.7-p330@global/gems/actionmailer-3.0.3/lib/action_mailer/base.rb:446:in `process'
/home/user1/.rvm/gems/ruby-1.8.7-p330@global/gems/actionmailer-3.0.3/lib/action_mailer/base.rb:441:in `initialize'
/home/user1/.rvm/gems/ruby-1.8.7-p330@global/gems/actionmailer-3.0.3/lib/action_mailer/base.rb:425:in `new'
/home/user1/.rvm/gems/ruby-1.8.7-p330@global/gems/actionmailer-3.0.3/lib/action_mailer/base.rb:425:in `method_missing'
/home/user1/myapp/config/../lib/my/new_car_sender.rb:7:in `send_email'
/home/user1/.rvm/gems/ruby-1.8.7-p330@global/gems/activerecord-3.0.3/lib/active_record/relation.rb:13:in `each'
/home/user1/.rvm/gems/ruby-1.8.7-p330@global/gems/activerecord-3.0.3/lib/active_record/relation.rb:13:in `__send__'
/home/user1/.rvm/gems/ruby-1.8.7-p330@global/gems/activerecord-3.0.3/lib/active_record/relation.rb:13:in `each'
/home/user1/myapp/config/../lib/my/new_car_sender.rb:6:in `send_email'
/home/user1/myapp/lib/tasks/new_car_messages.rake:8
/home/user1/.rvm/gems/ruby-1.8.7-p330@global/gems/rake-0.8.7/lib/rake.rb:636:in `call'
/home/user1/.rvm/gems/ruby-1.8.7-p330@global/gems/rake-0.8.7/lib/rake.rb:636:in `execute'
/home/user1/.rvm/gems/ruby-1.8.7-p330@global/gems/rake-0.8.7/lib/rake.rb:631:in `each'
/home/user1/.rvm/gems/ruby-1.8.7-p330@global/gems/rake-0.8.7/lib/rake.rb:631:in `execute'
/home/user1/.rvm/gems/ruby-1.8.7-p330@global/gems/rake-0.8.7/lib/rake.rb:597:in `invoke_with_call_chain'
/home/user1/.rvm/rubies/ruby-1.8.7-p330/lib/ruby/1.8/monitor.rb:242:in `synchronize'
/home/user1/.rvm/gems/ruby-1.8.7-p330@global/gems/rake-0.8.7/lib/rake.rb:590:in `invoke_with_call_chain'
/home/user1/.rvm/gems/ruby-1.8.7-p330@global/gems/rake-0.8.7/lib/rake.rb:583:in `invoke'
/home/user1/.rvm/gems/ruby-1.8.7-p330@global/gems/rake-0.8.7/lib/rake.rb:2051:in `invoke_task'
/home/user1/.rvm/gems/ruby-1.8.7-p330@global/gems/rake-0.8.7/lib/rake.rb:2029:in `top_level'
/home/user1/.rvm/gems/ruby-1.8.7-p330@global/gems/rake-0.8.7/lib/rake.rb:2029:in `each'
/home/user1/.rvm/gems/ruby-1.8.7-p330@global/gems/rake-0.8.7/lib/rake.rb:2029:in `top_level'
/home/user1/.rvm/gems/ruby-1.8.7-p330@global/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling'
/home/user1/.rvm/gems/ruby-1.8.7-p330@global/gems/rake-0.8.7/lib/rake.rb:2023:in `top_level'
/home/user1/.rvm/gems/ruby-1.8.7-p330@global/gems/rake-0.8.7/lib/rake.rb:2001:in `run'
/home/user1/.rvm/gems/ruby-1.8.7-p330@global/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling'
/home/user1/.rvm/gems/ruby-1.8.7-p330@global/gems/rake-0.8.7/lib/rake.rb:1998:in `run'
/home/user1/.rvm/gems/ruby-1.8.7-p330@global/gems/rake-0.8.7/bin/rake:31
/home/user1/.rvm/gems/ruby-1.8.7-p330@global/bin/rake:19:in `load'
/home/user1/.rvm/gems/ruby-1.8.7-p330@global/bin/rake:19

Answer 1

If you have set up the local SMTP server then you should just provide connection details for that:

config.action_mailer.delivery_method = :smtp
config.action_mailer.smtp_settings = {
    :address              => "localhost",
    :port                 => 25
}

You should have that in your config/environments/*.rb files.

Answer 2

In order to send emails you need to setup an smtp server. It could be setup locally or use a remote service like Gmail, SendGrid or Mandrill. In your case I would suggest using mailcatcher.

From the docs:

How

1. gem install mailcatcher
2. mailcatcher
3. Go to http://localhost:1080/
4. Send mail through smtp://localhost:1025

Rails

To set up your rails app, I recommend adding this to your environments/development.rb:

config.action_mailer.delivery_method = :smtp config.action_mailer.smtp_settings = { :address => "localhost", :port => 1025 }