errors_arrays.rb

HTTP_ERRORS = [Timeout::Error, 
               Errno::EINVAL, 
               Errno::ECONNRESET, 
               EOFError,
               Net::HTTPBadResponse, 
               Net::HTTPHeaderSyntaxError,
               Net::ProtocolError]
                  
SMTP_SERVER_ERRORS = [TimeoutError, 
                      IOError, 
                      Net::SMTPUnknownError, 
                      Net::SMTPServerBusy, 
                      Net::SMTPAuthenticationError]

SMTP_CLIENT_ERRORS = [Net::SMTPFatalError, 
                      Net::SMTPSyntaxError]

SMTP_ERRORS = SMTP_SERVER_ERRORS + SMTP_CLIENT_ERRORS

# usage

class ApplicationController < ActionController::Base
  
  rescue_from *SMTP_SERVER_ERRORS, :with => :smtp_server_error
  rescue_from *SMTP_CLIENT_ERRORS, :with => :smtp_client_error
  
  rescue_from *SMTP_ERRORS do |error|
    notify_hoptoad error
  end
  
  protected
  
  def smtp_server_error
    flash[:warning] = "We encountered an internal issue while " <<
                      "attempting to deliver this email. " << 
                      "Please try again in a few minutes."
    render :action => :new
  end
  
  def smtp_client_error
    flash[:warning] = "The email address supplied is invalid. " <<
                      "Please check for spelling mistakes." 
    render :action => :new
  end
end