Although it says it fails to communicate, it does download some messages, but repeats them many times, and leaves other messages on server.

The details listed in the Debug message: Invalid end of line character

Exception:

com.zimbra.common.service.ServiceException: system failure: Synchronization of POP3 folder failed
ExceptionId:btpool0-8:1303644590600:3d83678cd6994484
Code:service.FAILURE
at com.zimbra.common.service.ServiceException.FAILURE (ServiceException.java:248)
at com.zimbra.cs.datasource.Pop3Sync.importData(Pop3S ync.java:150)
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.service.offline.OfflineSync.handle(O fflineSync.java:44)
at com.zimbra.soap.SoapEngine.dispatchRequest(SoapEng ine.java:420)
at com.zimbra.soap.SoapEngine.dispatch(SoapEngine.jav a:274)
at com.zimbra.soap.SoapEngine.dispatch(SoapEngine.jav a:158)
at com.zimbra.soap.SoapServlet.doWork(SoapServlet.jav a:291)
at com.zimbra.soap.SoapServlet.doPost(SoapServlet.jav a:212)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:727)
at com.zimbra.cs.servlet.ZimbraServlet.service(Zimbra Servlet.java:181)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:820)
at org.mortbay.jetty.servlet.ServletHolder.handle(Ser vletHolder.java:511)
at org.mortbay.jetty.servlet.ServletHandler.handle(Se rvletHandler.java:390)
at org.mortbay.jetty.security.SecurityHandler.handle( SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(Se ssionHandler.java:182)
at org.mortbay.jetty.handler.ContextHandler.handle(Co ntextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebA ppContext.java:418)
at org.mortbay.jetty.handler.ContextHandlerCollection .handle(ContextHandlerCollection.java:230)
at org.mortbay.jetty.handler.HandlerCollection.handle (HandlerCollection.java:114)
at org.mortbay.jetty.handler.HandlerWrapper.handle(Ha ndlerWrapper.java:152)
at org.mortbay.jetty.handler.rewrite.RewriteHandler.h andle(RewriteHandler.java:230)
at org.mortbay.jetty.handler.HandlerWrapper.handle(Ha ndlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(Htt pConnection.java:543)
at org.mortbay.jetty.HttpConnection$RequestHandler.co ntent(HttpConnection.java:939)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser. java:755)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpPa rser.java:218)
at org.mortbay.jetty.HttpConnection.handle(HttpConnec tion.java:405)
at org.mortbay.io.nio.SelectChannelEndPoint.run(Selec tChannelEndPoint.java:413)
at org.mortbay.thread.BoundedThreadPool$PoolThread.ru n(BoundedThreadPool.java:451)
Caused by: com.zimbra.cs.mailclient.ParseException: Invalid end of line character
at com.zimbra.cs.mailclient.pop3.ContentInputStream.f illBuffer(ContentInputStream.java:82)
at com.zimbra.cs.mailclient.pop3.ContentInputStream.r ead(ContentInputStream.java:40)
at java.io.InputStream.read(Unknown Source)
at com.zimbra.common.util.BufferStream.readFrom(Buffe rStream.java:184)
at com.zimbra.common.util.BufferStream.readFrom(Buffe rStream.java:174)
at com.zimbra.cs.datasource.MessageContent.readConten t(MessageContent.java:44)
at com.zimbra.cs.datasource.MessageContent.read(Messa geContent.java:34)
at com.zimbra.cs.datasource.Pop3Sync.fetchAndAddMessa ge(Pop3Sync.java:237)
at com.zimbra.cs.datasource.Pop3Sync.fetchAndDeleteMe ssages(Pop3Sync.java:199)
at com.zimbra.cs.datasource.Pop3Sync.importData(Pop3S ync.java:143)
... 32 more