Exchange 2007: Server running but no new email
No new email was being delivered for my Networknet.nl domain. The server specified by the second MX record was receiving new messages for my personal email address. I logged on to the Exchange 2007 server, but at first glance I could not see any issues. I opened Internet Explorer and browsed to http://centralops.net/co/EmailDossier.aspx.
Email Dossier from Centralops.net Allows you to validate and investigate email addresses.
SMTP session
[Contacting mx1.networknet.nl ...]
[Connected]
220 w2k8.Networknet.nl Microsoft ESMTP MAIL Service ready at Wed, 30 Dec 2009 17:41:56 +0100
EHLO hexillion.com
250-w2k8.Networknet.nl Hello [70.84.211.98]
250-SIZE 10485760
250-PIPELINING
250-DSN
250-ENHANCEDSTATUSCODES
250-STARTTLS
250-AUTH
250-8BITMIME
250-BINARYMIME
250 CHUNKING
MAIL FROM:<[email protected]>
452 4.3.1 Insufficient system resources
MAIL FROM:<>
452 4.3.1 Insufficient system resources
[Unfavorable reply code, cannot continue]
RSET
[Contacting mx2.networknet.nl ...]
[Connected]
The SMTP session showed the message 452 4.3.1 Insufficient system resources. I returned to the Exchange 2007 server and found that I had only 700 MB free on my C:\ volume. I opened Server Manager, checked the Application log in Event Viewer and filtered for Error events. The results included Event ID 15006:
Log Name: Application
Source: MSExchangeTransport
Date: 12/30/2009 5:50:22 PM
Event ID: 15006
Task Category: ResourceManager
Level: Error
Keywords: Classic
User: N/A
Computer:w2k8
Description:
The Microsoft Exchange Transport service is rejecting message submissions because the available disk space has dropped below the configured threshold.
Resource utilization of the following resources exceed the normal level:
Queue database and disk space ("C:\Program Files\Microsoft\Exchange Server\TransportRoles\data\Queue\mail.que") = 97% [Medium] [Normal=94% Medium=96% High=98%]
Queue database logging disk space ("C:\Program Files\Microsoft\Exchange Server\TransportRoles\data\Queue\") = 97% [Medium] [Normal=94% Medium=96% High=98%]
No components were disabled because of back pressure.
The following resources are in the normal state:
Version buckets = 0 [Normal] [Normal=80 Medium=120 High=200]
Private bytes = 0% [Normal] [Normal=71% Medium=73% High=75%]
Physical memory load = 81% [limit is 94% before message dehydration occurs.]
Free disk space was low, and the Microsoft Exchange Transport service had stopped. I ran Windows Backup to back up my Exchange 2007 server and truncate the Exchange log. This environment is hosted in a lab, and I had not yet configured scheduled backup jobs. That was something I needed to do soon.