rails 3 email sending problem
class UserMailer < ActionMailer::Base
  default :from => "user@gmail.com"

  def send_to(user)
    @user = user
    subject='welcome !'
    mail(:to=>'y.lan@gmail.com', :subject=>subject, :content_type => "text/html")
    mail.deliver
  end
end

def CarsController < BaseController
  ...
  def register_finish
    UserMailer.send_to(user)
  end

end

config.action_mailer.delivery_method = :smtp

 config.action_mailer.smtp_settings = {
     :address => "smtp.googlemail.com",
     :port => 532,
     :arguments => '-i'
    :enable_starttls_auto => true
   }

  config.action_mailer.perform_deliveries = true
  config.action_mailer.raise_delivery_errors = true

ActionMailer::Base.delivery_method = :smtp
ActionMailer::Base.smtp_settings = { ...}

config.action_mailer.delivery_method = :smtp
config.action_mailer.smtp_settings = {...}

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

ActionMailer::Base.delivery_method = :smtp

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

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