Modified in 'prova' now i get:
[31-Oct-2016 16:04:46 +0100]: <rllnndni> Recv: 220 michael.mail.tiscali.it ESMTP service ready
[31-Oct-2016 16:04:46 +0100]: <rllnndni> Send: EHLO prova
[31-Oct-2016 16:04:46 +0100]: <rllnndni> Recv: 250-michael.mail.tiscali.it hello [80.181.100.183], pleased to meet you
[31-Oct-2016 16:04:46 +0100]: <rllnndni> Recv: 250-AUTH LOGIN PLAIN CRAM-MD5 DIGEST-MD5
[31-Oct-2016 16:04:46 +0100]: <rllnndni> Recv: 250-SIZE 34865152
[31-Oct-2016 16:04:46 +0100]: <rllnndni> Recv: 250-ENHANCEDSTATUSCODES
[31-Oct-2016 16:04:46 +0100]: <rllnndni> Recv: 250-8BITMIME
[31-Oct-2016 16:04:46 +0100]: <rllnndni> Recv: 250 OK
[31-Oct-2016 16:04:46 +0100]: <rllnndni> Send: AUTH DIGEST-MD5
[31-Oct-2016 16:04:46 +0100]: <rllnndni> Recv: 334 cmVhbG09Im1pY2hhZWwubWFpbC50aXNjYWxpLml0Iixub25jZT0iNTdmY2E3MmUwMGQyZjQ3ZWJkZTcxNzNhOGVhZDgwNGQiLHFvcD0iYXV0aCIsY2hhcnNldD0idXRmLTgiLGFsZ29yaXRobT0ibWQ1LXNlc3Mi
[31-Oct-2016 16:04:46 +0100]: <rllnndni> Send: ****** [364]
[31-Oct-2016 16:04:46 +0100]: <rllnndni> Recv: 535 5.7.8 Authentication credentials invalid
[31-Oct-2016 16:04:46 +0100]: <rllnndni> Send: RSET
[31-Oct-2016 16:04:46 +0100]: <rllnndni> Recv: 250 2.0.0 OK
[31-Oct-2016 16:04:46 +0100]: <rllnndni> Send: QUIT
[31-Oct-2016 16:04:46 +0100]: <rllnndni> Recv: 221 2.0.0 michael.mail.tiscali.it closing connection
Modified auth type in 'LOGIN' and bum! it now works!