Don't use localhost as SMTP server

Use 127.0.0.1 as it for sure won't cause emails to be not delivered (it was my case for development environment of Rails 2.3 app).

config.action_mailer.smtp_settings = {
  :address => "127.0.0.1", 
  :port => 1025 
}

Bonuses:

• Use Mailcatcher for development
• Use sanitize_email for staging