I've got a user that will get the following message once in a while. Can anyone tell me what it means or point me in a direction to start fixing the issue? We're on Zimbra 5.0.6.

Error: This message could not be sent.

Subject: Email Issue

To: user@ourdomain.com



Note: Soap Fault. Please recreate and resend the message. Details below:

Error Code: service.FAILURE

Error Text: system failure: our.domain.local:389



<soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope"><soap:Header><context xmlns="urn:zimbra"/></soap:Header><soap:Body><soap:Fault><soap:Code><soa p:Value>soap:Receiver</soap:Value></soap:Code><soap:Reason><soap:Text>system failure: our.domain.local:389</soap:Text></soap:Reason><soap:detail><Error xmlns="urn:zimbra"><Code>service.FAILURE</Code><Trace>btpool0-756:1215698619672:2a03e9d11508d2dc</Trace></Error></soap:detail></soap:Fault></soap:Body></soap:Envelope>