config/initializers/setup_mail.rb
--------------------------------------------------------
ActionMailer::Base.smtp_settings = {
  :address              => "smtp.gmail.com",
  :port                 => 587,
  :domain               => "mydomain.com",
  :user_name            => "infogmail.com ",
  :password             => "+++++",
  :authentication       => "plain",
  :enable_starttls_auto => true
}
--------------------------------------------------------
i run : rails g mailer Emailer

and my App/mailer/emailer.rb


class Emailer < ActionMailer::Base
   def contact(recipient, subject, message, sent_at = Time.now)
      @subject = subject
      @recipients = recipient
      @from = 'info@gmail.com'
      @sent_on = sent_at
      @body["title"] = 'welcome'
      @body["email"] = 'info@gmail.com'
      @body["message"] = message
      @headers = {}
   end
end
--------------------------------------------------------
after i run : rails g controller Emailer

and my App/controller/emailer_controller.rb

class EmailerController < ApplicationController
  def index
      render  'app/views/emailer/index.rhtml'
   end
   def sendmail
      email = @params["email"]
      recipient = email["recipient"]
      subject = email["subject"]
      message = email["message"]
      Emailer.deliver_contact(recipient, subject, message)
      return if request.xhr?
      render :text => 'Message sent successfully'
   end
end
--------------------------------------------------------

 app\views\emails\index.rhtml

<h1>Send Email</h1>
<%= form_tag :action => 'sendmail', :method => :get %>
<p><label for="email_subject">Subject</label>:
<%= text_field 'email', 'subject' %></p>
<p><label for="email_recipient">Recipient</label>:
<%= text_field 'email', 'recipient' %></p>
<p><label for="email_message">Message</label><br/>
<%= text_area 'email', 'message' %></p>
<%= submit_tag "Send" %>
<% end %>
----------------------------

this code not running....why?it is correct?