title: How to configure to send email through localhost app server without authentication?
body: <p>I have configured the Rails mailer under config/initializers/ like following:</p>
  
  <p><strong>/config/initializers/setup_email.rb</strong></p>
  
  <pre><code>config.action_mailer.raise_delivery_errors = true
  
    ActionMailer::Base.smtp_settings = {
     :address =&gt; "smtp.gmail.com",
     :port =&gt; 587,
     :domain =&gt; 'gmail.com',
     :authentication =&gt; :plain,
     :user_name=&gt;&lt;username&gt;,
     :password=&gt;&lt;password&gt;,
     :enable_starttls_auto =&gt; true
  }
  </code></pre>
  
  <p>it works fine, I can send emails and get them received.</p>
  
  <p>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?</p>
  
  <p>--EDIT---
  When using localhost, the error message I got is:</p>
  
  <pre><code>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
  </code></pre>