this is the log

= Connecting to mail server.
Remote host connection complete. [0, OK]
= Connected.
< 220 cp-out7.libero.it ESMTP Service ready

EHLO nero
< 250-cp-out7.libero.it
< 250-DSN
< 250-8BITMIME
< 250-PIPELINING
< 250-HELP
< 250-AUTH DIGEST-MD5 PLAIN
< 250-DELIVERBY 300
< 250 SIZE 30000000
AUTH LOGIN
< 504 unsupported AUTH security mechanism

thanks

Sorry my english but i'm italian
When I setting E-mail Notification I push on SEND TEST MAIL and appears "504 unsupported AUTH security mechanism"
why?
where is the problem?