is it possible using state_machine for private message system?

[Maria Serrano Cáceres]

I have this model:

    class Message

      include Mongoid::Document

      include Mongoid::Timestamps::Created

      # Relationships 
       belongs_to :sender, :class_name => 'User', :inverse_of => :messages_sent
       belongs_to :receiver, :class_name => 'User', :inverse_of => :messages_received
       belongs_to :thread, :class_name => 'Message' # Reference to parent message
       has_many :replies, :class_name => 'Message', :foreign_key => 'thread_id'
       scope :in_reply_to, lambda { |message| where({:thread => message}).asc('created_at') }

       #validations
       validates_presence_of :username, :email, :subject, :body, :sender, :receiver
       validates_length_of :subject, :within => 10..70
       validates_length_of :body, :within => 10..1000

       #state machine has been read message?
       state_machine :has_been_read, :initial => :unread do
        event :read_message do
          transition :from => :unread, :to => :read
        end
        event :mark_unread do
           transition :from => :read, :to => :unread
        end
       end

       #state machine place_sender can be sent, draft, trash
       state_machine :place_sender, :initial => :draft do
        event :send_message do
         transition :from => :draft, :to => :sent
        end
        event :sender_send_to_trash do
         transition :from => :draft, :to => :drafts_trash
        end
       end

      #state machine place_sender can be inbox, trash, spam
       state_machine :place_receiver, :initial => :in_box do
        event :receiver_send_to_trash do
         transition :from => :inbox, :to => :trash
        end
        event :receiver_send_to_spam do
         transition :from => :inbox, :to => :spam
        end

       end

      end

My question is if is possible use state_machine for this objective or purpose, or we should use another gem or do otherwise.

Thank you very much!