class Mail::POP3


#=> Returns the first 10 emails in ascending order
Mail.find(:what => :first, :count => 10, :order => :asc)
instance of Message, not an array of Message instances.
count: number of emails to retrieve. The default value is 10. A value of 1 returns an
order: order of emails returned. Possible values are :asc or :desc. Default value is :asc.
what: last or first emails. The default is :first.
with the following options:
You can also pass options into Mail.find to locate an email in your pop mailbox
Mail.last #=> Returns the last unread email
Mail.first #=> Returns the first unread email
Mail.all #=> Returns an array of all emails
end
:enable_ssl => true }
:password => ‘<password>’,
:user_name => ‘<username>’,
:port => 995,
retriever_method :pop3, { :address => “pop.gmail.com”,
Mail.defaults do
=== Example of retrieving Emails from GMail:
While being retrieved, emails can be yielded if a block is given.
Each email retrieved (RFC2822) is given as an instance of Message.
The Pop3 retriever allows to get the last, first or all emails from a POP3 server.

def connection(&block)

Returns the connection object of the retrievable (IMAP or POP3) 
def connection(&block)
  raise ArgumentError.new('Mail::Retrievable#connection takes a block') unless block_given?
  start do |pop3|
    yield pop3
  end
end

def delete_all

Delete all emails from a POP3 server 
def delete_all
  start do |pop3|
    unless pop3.mails.empty?
      pop3.delete_all
      pop3.finish
    end
  end
end

def find(options = nil, &block)


is false. Use #find_and_delete if you would like this to default to true.
delete_after_find: flag for whether to delete each retreived email after find. Default
instance of Message, not an array of Message instances.
count: number of emails to retrieve. The default value is 10. A value of 1 returns an
order: order of emails returned. Possible values are :asc or :desc. Default value is :asc.
what: last or first emails. The default is :first.
Possible options:

Find emails in a POP3 mailbox. Without any options, the 5 last received emails are returned. 
def find(options = nil, &block)
  options = validate_options(options)
  
  start do |pop3|
    mails = pop3.mails
    pop3.reset # Clears all "deleted" marks. This prevents non-explicit/accidental deletions due to server settings.
    mails.sort! { |m1, m2| m2.number <=> m1.number } if options[:what] == :last
    mails = mails.first(options[:count]) if options[:count].is_a? Integer
    
    if options[:what].to_sym == :last && options[:order].to_sym == :desc ||
       options[:what].to_sym == :first && options[:order].to_sym == :asc ||
      mails.reverse!
    end
    
    if block_given?
      mails.each do |mail|
        new_message = Mail.new(mail.pop)
        new_message.mark_for_delete = true if options[:delete_after_find]
        yield new_message
        mail.delete if options[:delete_after_find] && new_message.is_marked_for_delete? # Delete if still marked for delete
      end
    else
      emails = []
      mails.each do |mail|
        emails << Mail.new(mail.pop)
        mail.delete if options[:delete_after_find]
      end
      emails.size == 1 && options[:count] == 1 ? emails.first : emails
    end
    
  end
end

def initialize(values) 

def initialize(values)
  self.settings = { :address              => "localhost",
                    :port                 => 110,
                    :user_name            => nil,
                    :password             => nil,
                    :authentication       => nil,
                    :enable_ssl           => false,
                    :read_timeout         => nil }.merge!(values)
end

def start(config = Configuration.instance, &block)

will be deleted when the session is closed.
marked for deletion via #find_and_delete or with the :delete_after_find option
Start a POP3 session and ensure that it will be closed in any case. Any messages 
def start(config = Configuration.instance, &block)
  raise ArgumentError.new("Mail::Retrievable#pop3_start takes a block") unless block_given?

  pop3 = Net::POP3.new(settings[:address], settings[:port], false)
  pop3.enable_ssl(OpenSSL::SSL::VERIFY_NONE) if settings[:enable_ssl]
  pop3.read_timeout = settings[:read_timeout] if settings[:read_timeout]
  pop3.start(settings[:user_name], settings[:password])

  yield pop3
ensure
  if defined?(pop3) && pop3 && pop3.started?
    pop3.finish
  end
end

def validate_options(options)

Set default options 
def validate_options(options)
  options = options ? Hash[options] : {}
  options[:count] ||= 10
  options[:order] ||= :asc
  options[:what]  ||= :first
  options[:delete_after_find] ||= false
  options
end