Model Name: Mac Pro
Model Identifier: MacPro1,1
Processor Name: Dual-Core Intel Xeon
Processor Speed: 3 GHz
Number Of Processors: 2
Total Number Of Cores: 4
L2 Cache (per processor): 4 MB
Memory: 8 GB
Bus Speed: 1.33 GHz
Boot ROM Version: MP11.005C.B08
SMC Version (system): 1.7f10


--

Debug message: Connection is closed

Exception:

com.zimbra.common.service.ServiceException: system failure: Folder sync failed
ExceptionId:sync-mbox-deregil@yahoo.com:1286995859945:66c718096e0f96fe
Code:service.FAILURE
at com.zimbra.common.service.ServiceException.FAILURE (ServiceException.java:248)
at com.zimbra.cs.datasource.imap.ImapSync.importData( ImapSync.java:162)
at com.zimbra.cs.datasource.imap.ImapSync.importData( ImapSync.java:129)
at com.zimbra.cs.offline.OfflineImport.importData(Off lineImport.java:94)
at com.zimbra.cs.offline.YMailImport.importData(YMail Import.java:53)
at com.zimbra.cs.datasource.DataSourceManager.importD ata(DataSourceManager.java:254)
at com.zimbra.cs.datasource.DataSourceManager.importD ata(DataSourceManager.java:219)
at com.zimbra.cs.mailbox.DataSourceMailbox.syncAllLoc alDataSources(DataSourceMailbox.java:430)
at com.zimbra.cs.mailbox.DataSourceMailbox.sync(DataS ourceMailbox.java:460)
at com.zimbra.cs.mailbox.DataSourceMailbox.syncOnTime r(DataSourceMailbox.java:397)
at com.zimbra.cs.mailbox.SyncMailbox$1.run(SyncMailbo x.java:262)
at java.util.TimerThread.mainLoop(Timer.java:512)
at java.util.TimerThread.run(Timer.java:462)
Caused by: com.zimbra.common.service.ServiceException: system failure: Synchronization of folder '/Sent' failed
ExceptionId:sync-mbox-deregil@yahoo.com:1286995859945:66c718096e0f96fe
Code:service.FAILURE
at com.zimbra.common.service.ServiceException.FAILURE (ServiceException.java:248)
at com.zimbra.cs.datasource.imap.ImapSync.syncFailed( ImapSync.java:360)
at com.zimbra.cs.datasource.imap.ImapSync.syncMessage s(ImapSync.java:301)
at com.zimbra.cs.datasource.imap.ImapSync.syncFolders (ImapSync.java:232)
at com.zimbra.cs.datasource.imap.ImapSync.importData( ImapSync.java:157)
... 11 more
Caused by: java.io.IOException: Connection is closed
at com.zimbra.cs.mailclient.imap.ImapConnection.sendR equest(ImapConnection.java:502)
at com.zimbra.cs.mailclient.imap.ImapRequest.send(Ima pRequest.java:96)
at com.zimbra.cs.mailclient.imap.ImapRequest.sendChec kStatus(ImapRequest.java:112)
at com.zimbra.cs.mailclient.imap.ImapConnection.doSel ectOrExamine(ImapConnection.java:208)
at com.zimbra.cs.mailclient.imap.ImapConnection.selec t(ImapConnection.java:195)
at com.zimbra.cs.datasource.imap.RemoteFolder.select( RemoteFolder.java:188)
at com.zimbra.cs.datasource.imap.ImapFolderSync.syncM essages(ImapFolderSync.java:216)
at com.zimbra.cs.datasource.imap.ImapSync.syncMessage s(ImapSync.java:298)
... 13 more

If issue persists please post description and debug information here.