(5/5)
The add-on comes with a readme file and full documentation which explains everything about this add-on. It contains contact information, an introduction to the add-on, load/unload directions, the syntax and a version history.
Well done!

      (5/5)
This add-on behaves like a MemoServ bot. You register with a password and then you will be able to send messages via the BOT to other nicknames. The bot acts like a Mailbox/Memo service and whenever the nickname is online, the bot notifies the nickname that there is a memo waiting to be read.
 
The bot provides a help command too.
 
When you send/read memos you send the command to the bot via '/msg' but the bot replies via '/notice'.
 
Data is stored in Hash Tables, in order to retrieve it faster and that gives more functionality to the add-on.
 
While reading the code and testing the add-on I noticed that nicknames and messages are stored with the network name, which will prevent mixing between nicknames as the bot might be connected to more than one IRC network.
The bot works smoothly.
 
Tthe author has also included flood protection, in order to protect the bot from being flooded, well done.

     (4/5)
The dialog interface looks decent, tab controls makes it easy to set options, the dialog looks fine, but could look better :).

This add-on is pretty handy. It gives an option to use a bot as a standalone memo service which can be used to send/receive memos/messages in a pretty secure way, because to send/read you have to supply a password.
 
My Suggestions for this add-on are:
1. Multi-server support (enable/disable for specific networks)
 
Good job, xdaemon!