application_mailbox.rb

class ApplicationMailbox < ActionMailbox::Base
  # Any of the recipients of the mail (whether to, cc, bcc) are matched against the regexp.
  routing /^replies@/i => :replies

  # Any of the recipients of the mail (whether to, cc, bcc) needs to be an exact match for the string.
  routing "help@example.com" => :help

  # Any inbound_email that has not been already matched will be sent to the BackstopMailbox.
  routing :all => :backstop
end