Hello,
the problem happens after you update to CU9 from CU8: authenticated emails from computer running WSUS and File Server Resource Manager (that autenticate using the computer account) are not running anymore. Before they was running.
This is the debug of the SMTP conversation AT THE CU8 -- RUNNING
2015-06-23T06:11:39.435Z,ITMILEX999\Internal,08D27B82C2B20D7C,0,10.0.0.2:25,10.0.0.1:51258,+,,
2015-06-23T06:11:39.435Z,ITMILEX999\Internal,08D27B82C2B20D7C,1,10.0.0.2:25,10.0.0.1:51258,*,None,Set Session Permissions
2015-06-23T06:11:39.435Z,ITMILEX999\Internal,08D27B82C2B20D7C,2,10.0.0.2:25,10.0.0.1:51258,>,"220 ITMILEX999.contoso.com Microsoft ESMTP MAIL Service ready at Tue, 23 Jun 2015 08:11:38 +0200",
2015-06-23T06:11:39.435Z,ITMILEX999\Internal,08D27B82C2B20D7C,3,10.0.0.2:25,10.0.0.1:51258,<,EHLO ITMILDC999,
2015-06-23T06:11:39.435Z,ITMILEX999\Internal,08D27B82C2B20D7C,4,10.0.0.2:25,10.0.0.1:51258,*,None,Set Session Permissions
2015-06-23T06:11:39.435Z,ITMILEX999\Internal,08D27B82C2B20D7C,5,10.0.0.2:25,10.0.0.1:51258,>,250-ITMILEX999.contoso.com Hello [10.0.0.1],
2015-06-23T06:11:39.435Z,ITMILEX999\Internal,08D27B82C2B20D7C,6,10.0.0.2:25,10.0.0.1:51258,>,250-SIZE,
2015-06-23T06:11:39.435Z,ITMILEX999\Internal,08D27B82C2B20D7C,7,10.0.0.2:25,10.0.0.1:51258,>,250-PIPELINING,
2015-06-23T06:11:39.435Z,ITMILEX999\Internal,08D27B82C2B20D7C,8,10.0.0.2:25,10.0.0.1:51258,>,250-DSN,
2015-06-23T06:11:39.435Z,ITMILEX999\Internal,08D27B82C2B20D7C,9,10.0.0.2:25,10.0.0.1:51258,>,250-ENHANCEDSTATUSCODES,
2015-06-23T06:11:39.435Z,ITMILEX999\Internal,08D27B82C2B20D7C,10,10.0.0.2:25,10.0.0.1:51258,>,250-AUTH NTLM,
2015-06-23T06:11:39.435Z,ITMILEX999\Internal,08D27B82C2B20D7C,11,10.0.0.2:25,10.0.0.1:51258,>,250-8BITMIME,
2015-06-23T06:11:39.435Z,ITMILEX999\Internal,08D27B82C2B20D7C,12,10.0.0.2:25,10.0.0.1:51258,>,250-BINARYMIME,
2015-06-23T06:11:39.435Z,ITMILEX999\Internal,08D27B82C2B20D7C,13,10.0.0.2:25,10.0.0.1:51258,>,250 CHUNKING,
2015-06-23T06:11:39.435Z,ITMILEX999\Internal,08D27B82C2B20D7C,14,10.0.0.2:25,10.0.0.1:51258,<,AUTH ntlm,
2015-06-23T06:11:39.435Z,ITMILEX999\Internal,08D27B82C2B20D7C,15,10.0.0.2:25,10.0.0.1:51258,>,334 <authentication response>,
2015-06-23T06:11:39.481Z,ITMILEX999\Internal,08D27B82C2B20D7C,16,10.0.0.2:25,10.0.0.1:51258,*,SMTPSubmit SMTPAcceptAnyRecipient BypassAntiSpam AcceptRoutingHeaders,Set Session Permissions
2015-06-23T06:11:39.481Z,ITMILEX999\Internal,08D27B82C2B20D7C,17,10.0.0.2:25,10.0.0.1:51258,*,CONTOSO\ITMILDC999$,authenticated
2015-06-23T06:11:39.513Z,ITMILEX999\Internal,08D27B82C2B20D7C,18,10.0.0.2:25,10.0.0.1:51258,*,,Proxy session was successfully set up. Outbound session will now be proxied
2015-06-23T06:11:39.513Z,ITMILEX999\Internal,08D27B82C2B20D7C,19,10.0.0.2:25,10.0.0.1:51258,>,235 2.7.0 Authentication successful,
2015-06-23T06:11:39.763Z,ITMILEX999\Internal,08D27B82C2B20D7C,20,10.0.0.2:25,10.0.0.1:51258,-,,Local
This is the debug after upgrading to CU9 -- BROKEN
2015-06-23T07:34:12.165Z,ITMILEX999\Internal,08D27B9E1BAF1B57,0,10.0.0.2:25,10.0.0.1:51489,+,,
2015-06-23T07:34:12.165Z,ITMILEX999\Internal,08D27B9E1BAF1B57,1,10.0.0.2:25,10.0.0.1:51489,*,None,Set Session Permissions
2015-06-23T07:34:12.196Z,ITMILEX999\Internal,08D27B9E1BAF1B57,2,10.0.0.2:25,10.0.0.1:51489,>,"220 ITMILEX999.contoso.com Microsoft ESMTP MAIL Service ready at Tue, 23 Jun 2015 09:34:11 +0200",
2015-06-23T07:34:12.462Z,ITMILEX999\Internal,08D27B9E1BAF1B57,3,10.0.0.2:25,10.0.0.1:51489,<,EHLO ITMILDC999,
2015-06-23T07:34:12.619Z,ITMILEX999\Internal,08D27B9E1BAF1B57,4,10.0.0.2:25,10.0.0.1:51489,*,None,Set Session Permissions
2015-06-23T07:34:12.619Z,ITMILEX999\Internal,08D27B9E1BAF1B57,5,10.0.0.2:25,10.0.0.1:51489,>,250-ITMILEX999.contoso.com Hello [10.0.0.1],
2015-06-23T07:34:12.619Z,ITMILEX999\Internal,08D27B9E1BAF1B57,6,10.0.0.2:25,10.0.0.1:51489,>,250-SIZE,
2015-06-23T07:34:12.619Z,ITMILEX999\Internal,08D27B9E1BAF1B57,7,10.0.0.2:25,10.0.0.1:51489,>,250-PIPELINING,
2015-06-23T07:34:12.619Z,ITMILEX999\Internal,08D27B9E1BAF1B57,8,10.0.0.2:25,10.0.0.1:51489,>,250-DSN,
2015-06-23T07:34:12.619Z,ITMILEX999\Internal,08D27B9E1BAF1B57,9,10.0.0.2:25,10.0.0.1:51489,>,250-ENHANCEDSTATUSCODES,
2015-06-23T07:34:12.619Z,ITMILEX999\Internal,08D27B9E1BAF1B57,10,10.0.0.2:25,10.0.0.1:51489,>,250-AUTH NTLM,
2015-06-23T07:34:12.619Z,ITMILEX999\Internal,08D27B9E1BAF1B57,11,10.0.0.2:25,10.0.0.1:51489,>,250-8BITMIME,
2015-06-23T07:34:12.619Z,ITMILEX999\Internal,08D27B9E1BAF1B57,12,10.0.0.2:25,10.0.0.1:51489,>,250-BINARYMIME,
2015-06-23T07:34:12.619Z,ITMILEX999\Internal,08D27B9E1BAF1B57,13,10.0.0.2:25,10.0.0.1:51489,>,250 CHUNKING,
2015-06-23T07:34:12.744Z,ITMILEX999\Internal,08D27B9E1BAF1B57,14,10.0.0.2:25,10.0.0.1:51489,<,AUTH ntlm,
2015-06-23T07:34:12.791Z,ITMILEX999\Internal,08D27B9E1BAF1B57,15,10.0.0.2:25,10.0.0.1:51489,>,334 <authentication response>,
2015-06-23T07:34:13.682Z,ITMILEX999\Internal,08D27B9E1BAF1B57,16,10.0.0.2:25,10.0.0.1:51489,*,SMTPSubmit SMTPAcceptAnyRecipient BypassAntiSpam AcceptRoutingHeaders,Set Session Permissions
2015-06-23T07:34:13.682Z,ITMILEX999\Internal,08D27B9E1BAF1B57,17,10.0.0.2:25,10.0.0.1:51489,*,CONTOSO\ITMILDC999$,authenticated
2015-06-23T07:34:26.949Z,ITMILEX999\Internal,08D27B9E1BAF1B57,18,10.0.0.2:25,10.0.0.1:51489,*,,Setting up client proxy session failed with error: 535 5.7.3 Unable to proxy authenticated session because either the backend does not support it or failed to resolve
the user
2015-06-23T07:34:26.949Z,ITMILEX999\Internal,08D27B9E1BAF1B57,19,10.0.0.2:25,10.0.0.1:51489,*,,"Setting up client proxy session failed with error: 451 4.4.0 Primary target IP address responded with: ""535 5.7.3 Unable to proxy authenticated session
because either the backend does not support it or failed to resolve the user."" Attempted failover to alternate host, but that did not succeed. Either there are no alternate hosts, or delivery failed to all alternate hosts. The last endpoint attempted
was 10.0.0.2:465"
2015-06-23T07:34:26.949Z,ITMILEX999\Internal,08D27B9E1BAF1B57,20,10.0.0.2:25,10.0.0.1:51489,*,None,Set Session Permissions
2015-06-23T07:34:26.965Z,ITMILEX999\Internal,08D27B9E1BAF1B57,21,10.0.0.2:25,10.0.0.1:51489,*,Tarpit for '0.00:00:05' due to '535 5.7.3 Unable to proxy authenticated session because either the backend does not support it or failed to resolve the user',
2015-06-23T07:34:32.282Z,ITMILEX999\Internal,08D27B9E1BAF1B57,22,10.0.0.2:25,10.0.0.1:51489,>,535 5.7.3 Unable to proxy authenticated session because either the backend does not support it or failed to resolve the user,
2015-06-23T07:34:32.314Z,ITMILEX999\Internal,08D27B9E1BAF1B57,23,10.0.0.2:25,10.0.0.1:51489,<MAIL FROM:<FSRM @ contoso.com>,
2015-06-23T07:34:32.314Z,ITMILEX999\Internal,08D27B9E1BAF1B57,24,10.0.0.2:25,10.0.0.1:51489,*,Tarpit for '0.00:00:05' due to '530 5.7.1 Client was not authenticated',
2015-06-23T07:34:37.334Z,ITMILEX999\Internal,08D27B9E1BAF1B57,25,10.0.0.2:25,10.0.0.1:51489,>,530 5.7.1 Client was not authenticated,
2015-06-23T07:34:37.334Z,ITMILEX999\Internal,08D27B9E1BAF1B57,26,10.0.0.2:25,10.0.0.1:51489,-,,Local
Ciao,
Luca