Sample script for the mail gem.

mail.rb

#!/usr/bin/env ruby

require "mail"
require "optparse"

imap_opts = {
  :address    => "imap.gmail.com",
  :port       => 993,
  :enable_ssl => true
}

ARGV.options do |o|
  o.banner = "Usage:\n    #{$0} [options]"
  o.on_head("Options:")
  o.on('-s', '--imap-server=ADDR', String, "Imap server") { |s| imap_opts[:address] = s }
  o.on('-p', '--imap-password=PASS', String, "Imap password") { |p| imap_opts[:password] = p }
  o.on('-u', '--imap-user=USER', String, "Imap user name") { |u| imap_opts[:user_name] = u }
  o.on_tail("\nExample:\n    #{$0} -u [email protected] -p xxx")
end

begin
  ARGV.options.parse!
  if imap_opts[:user_name].nil? || imap_opts[:password].nil?
    puts ARGV.options
    raise ArgumentError rescue exit
  end

  Mail.defaults do
    retriever_method :imap, imap_opts
  end

  emails = Mail.find(:what => :last, :count => 11, :order => :dsc)

  emails.each do |mail|
    puts "\"#{mail.subject}\" from #{mail.from.first}"
  end
end

exit