How to handle ActionMailer errors ?

Question

Hi,

In production, ActionMailer shows following errors, that are displayed in a log:

Errno::ECONNREFUSED (Connection refused - connect(2)):
  /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/net/smtp.rb:551:in `initialize'
  /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/net/smtp.rb:551:in `open'
  /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/net/smtp.rb:551:in `do_start'
  /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/timeout.rb:62:in `timeout'
  /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/timeout.rb:93:in `timeout'
  /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/net/smtp.rb:551:in `do_start'
  /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/net/smtp.rb:525:in `start'         

How to handle it, to show a notice to a user ?

---

Update:

The error, that i described above, does't appears anymore, because i forget to configure the smtp connection. I have done following:

# Disable delivery errors, bad email addresses will be ignored
config.action_mailer.raise_delivery_errors = true

# set delivery method to :smtp, :sendmail or :test
config.action_mailer.delivery_method = :smtp

# these options are only needed if you choose smtp delivery
config.action_mailer.smtp_settings = {
  :address        => 'stmp.mail.ru',
  :port           => 25,
  :domain         => 'www.my_website.com',
  :authentication => :login,
  :user_name      => 'my_login',
  :password       => 'my_password'
}

But, another errors appears:

SocketError (getaddrinfo: nodename nor servname provided, or not known): /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/net/smtp.rb:551:in initialize' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/net/smtp.rb:551:inopen' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/net/smtp.rb:551:in do_start' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/timeout.rb:62:intimeout' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/timeout.rb:93:in timeout' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/net/smtp.rb:551:indo_start' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/net/smtp.rb:525:in start' app/models/user_observer.rb:8:inafter_create' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/observer.rb:185:in notify_observers' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/observer.rb:184:ineach' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/observer.rb:184:in notify_observers' app/controllers/users_controller.rb:121:increate' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/webrick/httpserver.rb:104:in service' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/webrick/httpserver.rb:65:inrun' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/webrick/server.rb:173:in start_thread' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/webrick/server.rb:162:instart' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/webrick/server.rb:162:in start_thread' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/webrick/server.rb:95:instart' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/webrick/server.rb:92:in each' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/webrick/server.rb:92:instart' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/webrick/server.rb:23:in start' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/webrick/server.rb:82:instart' -e:2:in `load' -e:2

I have doublechecked the settings. Everything is correct.

The only fields, i'm not know about - is "domain".

What is the purpose of this field ?