The stages tested :

1. In File > Select Server > Connect > Email with "ScRiPt123456789123456@nomail.com" - Once connected to the irc I have this: [00:18:46] *** Client connecting: joo (ScRiPt12345678912345@ (It's OK)

2. Now i type //echo -a $address(joo,0),1,64) - He returns 10 last chars : *!5678912345@2BFB4C7X.3EC376CX.C075ED4X.IP - The problem does not come from the connection with mirc and "identd" nor "email" but rather with $addresss