Our system is logging about 500KB/sec to mailbox.log with the following, I have no idea what the issue is. zmcontrol shows every service running:

2013-07-17 10:34:05,124 INFO [Index-9] [name=xxxxx@xxxx;mid=32;] HttpMethodDirector - I/O exception (java.net.ConnectException) caught when processing request: Connection refused
2013-07-17 10:34:05,124 INFO [Index-9] [name=xxxxx@xxxx;mid=32;] HttpMethodDirector - Retrying request
2013-07-17 10:34:05,124 WARN [Index-9] [name=xxxxx@xxxx;mid=32;] ParsedMessage - Unable to parse part=3 filename=image002.jpg content-type=image/jpeg message-id=<E518F344CD178F4DB0B14D347B9EAF732ED2FB3E54@SBS 08.AltmanCharterCompany.local>
com.zimbra.cs.mime.MimeHandlerException: extraction failed
at com.zimbra.cs.mime.handler.ConverterHandler.getCon tentImpl(ConverterHandler.java:114)
at com.zimbra.cs.mime.MimeHandler.getContent(MimeHand ler.java:155)
at com.zimbra.cs.mime.ParsedMessage.analyzePart(Parse dMessage.java:1126)
at com.zimbra.cs.mime.ParsedMessage.analyzeNonBodyPar ts(ParsedMessage.java:430)
at com.zimbra.cs.mime.ParsedMessage.analyzeFully(Pars edMessage.java:461)
at com.zimbra.cs.mailbox.Message.generateIndexData(Me ssage.java:1261)
at com.zimbra.cs.mailbox.MailboxIndex.indexItemList(M ailboxIndex.java:736)
at com.zimbra.cs.mailbox.MailboxIndex.indexDeferredIt ems(MailboxIndex.java:373)
at com.zimbra.cs.mailbox.MailboxIndex.access$600(Mail boxIndex.java:83)
at com.zimbra.cs.mailbox.MailboxIndex$BatchIndexTask. exec(MailboxIndex.java:1404)
at com.zimbra.cs.mailbox.MailboxIndex$IndexTask.run(M ailboxIndex.java:1383)
at java.util.concurrent.Executors$RunnableAdapter.cal l(Executors.java:471)
at java.util.concurrent.FutureTask$Sync.innerRun(Futu reTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.jav a:166)
at java.util.concurrent.ThreadPoolExecutor.runWorker( ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run (ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:722)
Caused by: com.zimbra.cs.convert.ConversionException: connect failed
... 17 more

Our system is: Release 8.0.3_GA_5664.RHEL6_64_20130305090219 CentOS6_64 NETWORK edition