A couple of weeks after upgrading from 6NE to 7NE we started to get these problems with sending mail (from both the zimbra desktop and the web browser). It's obviously a server issue but don't know why. The problem occurs only in the morning, after several hous of no use (if that means anything).

The error message(s) are generally as follows:


From: "Desktop Notifier" <donotreply@host.local>
To: XXXX@jvnla.com
Sent: Tuesday, October 2, 2012 8:30:02 AM
Subject: Delivery Failure Notification: mail.SEND_FAILURE

Your message "Appointments Summary: You have 5 appointments today" sent on October 2, 2012 at 8:29 AM to "xxxx xxxx <xxxx@jvnla.com>" can't be delivered. None of the recipients will receive the message. It has been returned to Drafts folder for your review.

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Product name: Zimbra Desktop
Product version: 7.2.1
Build ID: 11637
Release type: GA
OS Platform: Linux i386 2.6.38-15-generic
Time of event: 2012-10-02 08:30:02
Error type: mail.SEND_FAILURE
Item ID: 1073759480
Error summary: send mail failed

Failure details - PLEASE REMOVE ANY SENSITIVE INFORMATION
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<soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope"><soap:Header><context xmlns="urn:zimbra"><authToken>0_5af9519254c9678eab 6e08f6ee60adf755a6d276_69643d33363a643031316131386 52d663162392d346331332d396134332d35643439373136623 23265653b6578703d31333a313334393335333633363936353 b76763d313a303b747970653d363a7a696d6272613b</authToken><nosession/><userAgent name="Zimbra Desktop" version="7.2.1_11637_Linux"/></context></soap:Header><soap:Body><SendMsgRequest suid="c5ebb03f-eb04-4232-b053-2d79f2afcfd4" xmlns="urn:zimbraMail"><m aid="c26f2b90-293b-469b-9b81-f21073c15a63:7366c407-a80a-4af6-a898-89bf2fa81bd9"/></SendMsgRequest></soap:Body></soap:Envelope>

<soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope"><soap:Header><context xmlns="urn:zimbra"><change token="786604"/></context></soap:Header><soap:Body><soap:Fault><soap:Code><soa p:Value>soap:Sender</soap:Value></soap:Code><soap:Reason><soap:Text>SMTP server reported: MESSAGE_NOT_DELIVERED</soap:Text></soap:Reason><soapetail><Error xmlns="urn:zimbra"><Code>mail.SEND_FAILURE</Code><Trace>btpool0-349://mail2.jvnla.com/service/soap/SendMsgRequest:1349180875891:0bd73021368dfa53</Trace></Error></soapetail></soap:Fault></soap:Body></soap:Envelope>

com.zimbra.common.soap.SoapFaultException: SMTP server reported: MESSAGE_NOT_DELIVERED
ExceptionId:btpool0-349://mail2.jvnla.com/service/soap/SendMsgRequest:1349180875891:0bd73021368dfa53
Code:mail.SEND_FAILURE
at com.zimbra.common.soap.Soap12Protocol.soapFault(So ap12Protocol.java:88)
at com.zimbra.common.soap.SoapTransport.extractBodyEl ement(SoapTransport.java:354)
at com.zimbra.common.soap.SoapTransport.parseSoapResp onse(SoapTransport.java:313)
at com.zimbra.common.soap.SoapHttpTransport.invoke(So apHttpTransport.java:260)
at com.zimbra.common.soap.SoapHttpTransport.invoke(So apHttpTransport.java:164)
at com.zimbra.common.soap.SoapTransport.invoke(SoapTr ansport.java:407)
at com.zimbra.common.soap.SoapTransport.invokeWithout Session(SoapTransport.java:393)
at com.zimbra.cs.mailbox.ZcsMailbox.sendRequest(ZcsMa ilbox.java:678)
at com.zimbra.cs.mailbox.ZcsMailbox.sendRequest(ZcsMa ilbox.java:640)
at com.zimbra.cs.mailbox.ZcsMailbox.sendRequest(ZcsMa ilbox.java:635)
at com.zimbra.cs.mailbox.ZcsMailbox.sendRequest(ZcsMa ilbox.java:628)
at com.zimbra.cs.mailbox.ZcsMailbox.sendRequest(ZcsMa ilbox.java:624)
at com.zimbra.cs.mailbox.ZcsMailbox.sendRequest(ZcsMa ilbox.java:620)
at com.zimbra.cs.mailbox.ZcsMailbox.sendRequest(ZcsMa ilbox.java:616)
at com.zimbra.cs.mailbox.PushChanges.sendPendingMessa ges(PushChanges.java:393)
at com.zimbra.cs.mailbox.PushChanges.sendPendingMessa ges(PushChanges.java:458)
at com.zimbra.cs.mailbox.MailboxSync.sync(MailboxSync .java:153)
at com.zimbra.cs.mailbox.ZcsMailbox.sync(ZcsMailbox.j ava:124)
at com.zimbra.cs.mailbox.ZcsMailbox.syncOnTimer(ZcsMa ilbox.java:105)
at com.zimbra.cs.mailbox.SyncMailbox$1.run(SyncMailbo x.java:279)
at java.util.TimerThread.mainLoop(Timer.java:512)
at java.util.TimerThread.run(Timer.java:462)

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I'm not sure how to read this. So any help appreciated.