# File email/lib/symbiosis/domain/mailbox.rb, line 514
    def self.find_mailbox(address, prefix="/srv")
      raise ArgumentError, "Address is not a String" unless address.is_a?(String)
      address = address.downcase.split("@")

      domain = address.pop
      local_part = address.join("@")

      domain = find(domain, prefix)
      return nil if domain.nil?

      return domain.find_mailbox(local_part)
    end