Eu defini configurações de smtp em ambosconfig/environments/production.rb edevelopment.rb Também adicionei as configurações em `config / initializers / setup_mail.rb

config.action_mailer.default_url_options = { :host => 'ipaddress' }
config.action_mailer.delivery_method = :smtp
config.action_mailer.smtp_settings = {
  :address              => 'smtp.gmail.com',
  :port                 => 587,
  :domain               => 'gmail.com',
  :user_name            => '[email protected]',
  :password             => 'pass',
  :authentication       => :plain,
  :enable_starttls_auto => true,
  :openssl_verify_mode  => 'none'
}

config / inicializadores / setup_mail.rb

ActionMailer::Base.smtp_settings = { 
  :address              => 'smtp.gmail.com',
  :port                 => 587,
  :domain               => 'gmail.com',
  :user_name            => '[email protected]',
  :password             => 'pass',
  :authentication       => :plain,
  :enable_starttls_auto => true,
  :openssl_verify_mode  => 'none'
} 

ActionMailer::Base.default_url_options[:host] = "ipaddress" 

estou recebendo o erroConnection refused - connect(2)

enquanto eu estiver trabalhando no host local com a configuração abaixo, não recebo nenhum erro e também os e-mails foram enviados.

config / inicializadores / setup_mail.rb (localhost)

ActionMailer::Base.smtp_settings = { 
  :address              => 'smtp.gmail.com',
  :port                 => 587,
  :domain               => 'localhost',
  :user_name            => '[email protected]',
  :password             => 'pass',
  :authentication       => 'plain',
  :enable_starttls_auto => true
} 

ActionMailer::Base.default_url_options[:host] = "localhost:3000" 

Os erros são mostrados abaixo durante a execução no console,

Errno::ECONNREFUSED: Connection refused - connect(2)
from /home/attuser/.rvm/rubies/ruby-1.9.3-p545/lib/ruby/1.9.1/net/smtp.rb:541:in `initialize'
from /home/attuser/.rvm/rubies/ruby-1.9.3-p545/lib/ruby/1.9.1/net/smtp.rb:541:in `open'
from /home/attuser/.rvm/rubies/ruby-1.9.3-p545/lib/ruby/1.9.1/net/smtp.rb:541:in `tcp_socket'
from /home/attuser/.rvm/rubies/ruby-1.9.3-p545/lib/ruby/1.9.1/net/smtp.rb:550:in `block in do_start'
from /home/attuser/.rvm/rubies/ruby-1.9.3-p545/lib/ruby/1.9.1/timeout.rb:69:in `timeout'
from /home/attuser/.rvm/rubies/ruby-1.9.3-p545/lib/ruby/1.9.1/timeout.rb:100:in `timeout'
from /home/attuser/.rvm/rubies/ruby-1.9.3-p545/lib/ruby/1.9.1/net/smtp.rb:550:in `do_start'
from /home/attuser/.rvm/rubies/ruby-1.9.3-p545/lib/ruby/1.9.1/net/smtp.rb:520:in `start'
from /home/attuser/.rvm/gems/ruby-1.9.3-p545/gems/mail-2.4.4/lib/mail/network/delivery_methods/smtp.rb:144:in `deliver!'
from /home/attuser/.rvm/gems/ruby-1.9.3-p545/gems/mail-2.4.4/lib/mail/message.rb:2034:in `do_delivery'
from /home/attuser/.rvm/gems/ruby-1.9.3-p545/gems/mail-2.4.4/lib/mail/message.rb:229:in `block in deliver'
from /home/attuser/.rvm/gems/ruby-1.9.3-p545/gems/actionmailer-3.2.9/lib/action_mailer/base.rb:415:in `block in deliver_mail'
from /home/attuser/.rvm/gems/ruby-1.9.3-p545/gems/activesupport-3.2.9/lib/active_support/notifications.rb:123:in `block in instrument'
from /home/attuser/.rvm/gems/ruby-1.9.3-p545/gems/activesupport-3.2.9/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
from /home/attuser/.rvm/gems/ruby-1.9.3-p545/gems/activesupport-3.2.9/lib/active_support/notifications.rb:123:in `instrument'
from /home/attuser/.rvm/gems/ruby-1.9.3-p545/gems/actionmailer-3.2.9/lib/action_mailer/base.rb:413:in `deliver_mail'
from /home/attuser/.rvm/gems/ruby-1.9.3-p545/gems/mail-2.4.4/lib/mail/message.rb:229:in `deliver'
from (irb):28
from /home/attuser/.rvm/gems/ruby-1.9.3-p545/gems/railties-3.2.9/lib/rails/commands/console.rb:47:in `start'
from /home/attuser/.rvm/gems/ruby-1.9.3-p545/gems/railties-3.2.9/lib/rails/commands/console.rb:8:in `start'
from /home/attuser/.rvm/gems/ruby-1.9.3-p545/gems/railties-3.2.9/lib/rails/commands.rb:41:in `<top (required)>'
from script/rails:6:in `require'

controlador

def sendResume
@name =params[:name]
@email_id = params[:email_id]
@mob_no = params[:ph_no]

attachments = params[:resume]
if simple_captcha_valid?

 if params[:resume]
     filename=attachments.original_filename   

    extname = File.extname(filename)[1..-1]
    mime_type = Mime::Type.lookup_by_extension(extname)
    content_type = mime_type.to_s unless mime_type.nil?


        if content_type !="application/pdf"
           flash[:error]= "Only pdf files are allowed"
           redirect_to :action=>"careers"
        else
         File.open(Rails.root.join('tmp', 'uploads', attachments.original_filename), 'w') do |file|
          re = attachments.read
          file.write(re.force_encoding("utf-8"))
          @attached_path = file.path
        end


        begin
          ResumeMailer.sendResume(@name, @email_id, @mob_no, @attached_path, attachments.original_filename).deliver
          flash[:notice] = "Your resume has been submitted successfully"
          redirect_to :action=>"careers"
        rescue Exception => e
          puts e.message

          logger.warn "error sending mail"
          flash[:error]= "Error in submitting resume"
          redirect_to :action=>"careers"
        end

     end
    else
      flash[:error]= "Please upload your resume"
      redirect_to :action=>"careers"
    end
else

  flash[:error]= "Incorrect captcha"
   redirect_to :action=>"careers"
end

end

Depois de instalar opostfix o erro desaparece no modo de console e os e-mails são enviados do console, mas no modo gráfico (no navegador) estou recebendo o erroConnection refused - connect(2).

o que está errado,

desde já, obrigado.