Ciao ho fatto le prove che mi hai detto, la risposta è sempre negativa, ma i log di exchange sono variati. Te li allego.
2012-01-22T11:59:09.481Z,SERVER2008EXCH\Default SERVER2008EXCH,08CE6F76F2362D9E,2,192.168.16.100:25,172.16.17.2:3971,>,"220 SERVER2008EXCH.TRADETRASPORTI.IT Microsoft ESMTP MAIL Service ready at Sun, 22 Jan 2012 12:59:09 +0100",
2012-01-22T11:59:09.481Z,SERVER2008EXCH\Default SERVER2008EXCH,08CE6F76F2362D9E,3,192.168.16.100:25,172.16.17.2:3971,<,EHLO sever2011web,
2012-01-22T11:59:09.481Z,SERVER2008EXCH\Default SERVER2008EXCH,08CE6F76F2362D9E,4,192.168.16.100:25,172.16.17.2:3971,>,250-SERVER2008EXCH.TRADETRASPORTI.IT Hello [172.16.17.2],
2012-01-22T11:59:09.481Z,SERVER2008EXCH\Default SERVER2008EXCH,08CE6F76F2362D9E,5,192.168.16.100:25,172.16.17.2:3971,>,250-SIZE,
2012-01-22T11:59:09.481Z,SERVER2008EXCH\Default SERVER2008EXCH,08CE6F76F2362D9E,6,192.168.16.100:25,172.16.17.2:3971,>,250-PIPELINING,
2012-01-22T11:59:09.481Z,SERVER2008EXCH\Default SERVER2008EXCH,08CE6F76F2362D9E,7,192.168.16.100:25,172.16.17.2:3971,>,250-DSN,
2012-01-22T11:59:09.481Z,SERVER2008EXCH\Default SERVER2008EXCH,08CE6F76F2362D9E,8,192.168.16.100:25,172.16.17.2:3971,>,250-ENHANCEDSTATUSCODES,
2012-01-22T11:59:09.481Z,SERVER2008EXCH\Default SERVER2008EXCH,08CE6F76F2362D9E,9,192.168.16.100:25,172.16.17.2:3971,>,250-X-ANONYMOUSTLS,
2012-01-22T11:59:09.481Z,SERVER2008EXCH\Default SERVER2008EXCH,08CE6F76F2362D9E,10,192.168.16.100:25,172.16.17.2:3971,>,250-AUTH NTLM,
2012-01-22T11:59:09.481Z,SERVER2008EXCH\Default SERVER2008EXCH,08CE6F76F2362D9E,11,192.168.16.100:25,172.16.17.2:3971,>,250-X-EXPS GSSAPI NTLM,
2012-01-22T11:59:09.481Z,SERVER2008EXCH\Default SERVER2008EXCH,08CE6F76F2362D9E,12,192.168.16.100:25,172.16.17.2:3971,>,250-8BITMIME,
2012-01-22T11:59:09.481Z,SERVER2008EXCH\Default SERVER2008EXCH,08CE6F76F2362D9E,13,192.168.16.100:25,172.16.17.2:3971,>,250-BINARYMIME,
2012-01-22T11:59:09.481Z,SERVER2008EXCH\Default SERVER2008EXCH,08CE6F76F2362D9E,14,192.168.16.100:25,172.16.17.2:3971,>,250-CHUNKING,
2012-01-22T11:59:09.481Z,SERVER2008EXCH\Default SERVER2008EXCH,08CE6F76F2362D9E,15,192.168.16.100:25,172.16.17.2:3971,>,250-XEXCH50,
2012-01-22T11:59:09.481Z,SERVER2008EXCH\Default SERVER2008EXCH,08CE6F76F2362D9E,16,192.168.16.100:25,172.16.17.2:3971,>,250 XRDST,
2012-01-22T11:59:09.481Z,SERVER2008EXCH\Default SERVER2008EXCH,08CE6F76F2362D9E,17,192.168.16.100:25,172.16.17.2:3971,<,AUTH NTLM,
2012-01-22T11:59:09.481Z,SERVER2008EXCH\Default SERVER2008EXCH,08CE6F76F2362D9E,18,192.168.16.100:25,172.16.17.2:3971,>,334 <authentication response>,
2012-01-22T11:59:09.496Z,SERVER2008EXCH\Default SERVER2008EXCH,08CE6F76F2362D9E,19,192.168.16.100:25,172.16.17.2:3971,>,334 <authentication response>,
2012-01-22T11:59:09.496Z,SERVER2008EXCH\Default SERVER2008EXCH,08CE6F76F2362D9E,20,192.168.16.100:25,172.16.17.2:3971,*,,Inbound Negotiate failed because of LogonDenied
2012-01-22T11:59:14.504Z,SERVER2008EXCH\Default SERVER2008EXCH,08CE6F76F2362D9E,21,192.168.16.100:25,172.16.17.2:3971,>,535 5.7.3 Authentication unsuccessful,
2012-01-22T11:59:14.504Z,SERVER2008EXCH\Default SERVER2008EXCH,08CE6F76F2362D9E,22,192.168.16.100:25,172.16.17.2:3971,<,AUTH NTLM,
2012-01-22T11:59:14.504Z,SERVER2008EXCH\Default SERVER2008EXCH,08CE6F76F2362D9E,23,192.168.16.100:25,172.16.17.2:3971,>,334 <authentication response>,
2012-01-22T11:59:19.511Z,SERVER2008EXCH\Default SERVER2008EXCH,08CE6F76F2362D9E,24,192.168.16.100:25,172.16.17.2:3971,>,501 5.5.4 Authentication cancelled,
2012-01-22T11:59:19.511Z,SERVER2008EXCH\Default SERVER2008EXCH,08CE6F76F2362D9E,25,192.168.16.100:25,172.16.17.2:3971,<,MAIL FROM: <massimo.gherardini@tradetrasporti.it>,
2012-01-22T11:59:19.511Z,SERVER2008EXCH\Default SERVER2008EXCH,08CE6F76F2362D9E,26,192.168.16.100:25,172.16.17.2:3971,*,08CE6F76F2362D9E;2012-01-22T11:59:09.481Z;1,receiving message
2012-01-22T11:59:19.511Z,SERVER2008EXCH\Default SERVER2008EXCH,08CE6F76F2362D9E,27,192.168.16.100:25,172.16.17.2:3971,>,250 2.1.0 Sender OK,
2012-01-22T11:59:19.511Z,SERVER2008EXCH\Default SERVER2008EXCH,08CE6F76F2362D9E,28,192.168.16.100:25,172.16.17.2:3971,<,RCPT TO: <masgher2@gmail.com>,
2012-01-22T11:59:24.519Z,SERVER2008EXCH\Default SERVER2008EXCH,08CE6F76F2362D9E,29,192.168.16.100:25,172.16.17.2:3971,>,550 5.7.1 Unable to relay,
2012-01-22T11:59:24.519Z,SERVER2008EXCH\Default SERVER2008EXCH,08CE6F76F2362D9E,30,192.168.16.100:25,172.16.17.2:3971,<,QUIT,
2012-01-22T11:59:24.519Z,SERVER2008EXCH\Default SERVER2008EXCH,08CE6F76F2362D9E,31,192.168.16.100:25,172.16.17.2:3971,>,221 2.0.0 Service closing transmission channel,
2012-01-22T11:59:24.519Z,SERVER2008EXCH\Default SERVER2008EXCH,08CE6F76F2362D9E,32,192.168.16.100:25,172.16.17.2:3971,-,,Local
Grazie