Hi,i installed zimbra for e-mail server from feb 2006.
Its run all ok.
But now it has a problem,mailbox server down.
I checked zimbra.log and found a error like this.

2007-04-15 08:36:35,959 INFO [LmtpServer-491] [] LmtpHandler - [10.10.8.10] connected
2007-04-15 08:36:36,067 FATAL [LmtpServer-491] [] system - Fatal error occurred while handling connection
java.lang.Error: java.nio.charset.MalformedInputException: Input length = 1
at java.lang.StringCoding$CharsetSD.decode(StringCodi ng.java:199)
at java.lang.StringCoding.decode(StringCoding.java:22 8)
at java.lang.String.(String.java:405)
at javax.mail.internet.MimeUtility.decodeWord(MimeUti lity.java:755)
at javax.mail.internet.MimeUtility.decodeText(MimeUti lity.java:501)
at javax.mail.internet.MimeMessage.getSubject(MimeMes sage.java:704)
at com.zimbra.cs.mime.ParsedMessage.normalizeSubject( ParsedMessage.java:588)
at com.zimbra.cs.mime.ParsedMessage.getNormalizedSubj ect(ParsedMessage.java:224)
at com.zimbra.cs.index.TopLevelMessageHandler.getDocu ment(TopLevelMessageHandler.java:134)
at com.zimbra.cs.mime.ParsedMessage.analyzeMessage(Pa rsedMessage.java:438)
at com.zimbra.cs.mime.ParsedMessage.analyze(ParsedMes sage.java:155)
at com.zimbra.cs.lmtpserver.ZimbraLmtpBackend.deliver MessageToLocalMailboxes(ZimbraLmtpBackend.java:185 )
at com.zimbra.cs.lmtpserver.ZimbraLmtpBackend.deliver (ZimbraLmtpBackend.java:109)
at com.zimbra.cs.lmtpserver.LmtpHandler.doDATA(LmtpHa ndler.java:420)
at com.zimbra.cs.lmtpserver.LmtpHandler.processComman d(LmtpHandler.java:197)
at com.zimbra.cs.tcpserver.ProtocolHandler.processCon nection(ProtocolHandler.java:231)
at com.zimbra.cs.tcpserver.ProtocolHandler.run(Protoc olHandler.java:198)
at EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Wo rker.run(Unknown Source)
at java.lang.Thread.run(Thread.java:595)
Caused by: java.nio.charset.MalformedInputException: Input length = 1
at java.nio.charset.CoderResult.throwException(CoderR esult.java:260)
at java.lang.StringCoding$CharsetSD.decode(StringCodi ng.java:195)
... 18 more

zmcontrol -v
Release 3.0.0_GA_156.RHEL4_20060206122144 CentOS4 FOSS edition

zmcontrol status
antispam Running
antivirus Running
ldap Running
logger Running
mailbox Stopped
mta Running
snmp Running
spell Running

I dont know how to do.Please help me.Sorry for my poor english and thank you for your help.