Low Disk Space Handling in MailMarshal SMTP

This article applies to:

• Trustwave MailMarshal (SEG)

Question:

• How does MailMarshal SMTP handle low disk space on processing servers?

Information:

MailMarshal SMTP checks for available free space on the partition(s) where the working directories reside.

In current versions the disk space checking operates as follows:

• When free space drops below the delay mark, the Receiver throttles email acceptance by delaying before accepting each message (a minimum of 10 seconds by default).
  • A delay email notice is sent to the administrator the first time a message is delayed, and periodically thereafter (by default, after 24 hours; the notice is triggered when a message is delayed).
• When free space drops below the low mark, the Receiver stops accepting email. Each message is refused with a SMTP response indicating insufficient disk space.
  • A single email notice is sent to the administrator when the Receiver stops accepting email. (To avoid multiple notices when the free space is fluctuating around the low mark, no further email notice will be sent until the free space rises above the delay mark and then falls again.)
• These events are logged in the Windows event log and the MailMarshal Receiver log. You could monitor for the log entries using enterprise monitoring software.
• To configure these settings, you can enter a number of values in the Registry or MailMarshal (SEG) 10 Advanced Settings.

• DelayDiskMark: If free disk space falls below this value, the Receiver begins to throttle acceptance Enter a value in Megabytes (default: 512 MB).
  • DelayMinThreshold: Minimum seconds delay per message when throttling (default: 10).
  • NotifyInterval: Time between notification emails to administrator, in seconds (default: 86400 seconds [24 hours]).
• LowDiskMark: If free disk space falls below this value, the Receiver stops accepting email. Enter a value in Megabytes (default: 512 MB).

• In MailMarshal 10.0 and above, open the Management Console and navigate to Advanced Settings. Add one or more of the values:
  • Receiver.DelayDiskMark
  • Receiver.DelayMinThreshold
  • Receiver.NotifyInterval
  • Receiver.LowDiskMark
  • Type: Integer
  • Value: The required value as described above.
• In MailMarshal 8.X and below, open the Registry Editor on the Array Manager. Within the base registry key, navigate to \Default\Receiver
  • In version 8.X: HKEY_LOCAL_MACHINE\SOFTWARE\Trustwave\Secure Email Gateway\Default\Receiver
  • For information about the registry location for each version, see article Q10832.
  • Enter one or more values as DWORD values. Use Decimal numbers to avoid confusion.
    • DelayDiskMark
    • DelayMinThreshold
    • NotifyInterval
    • LowDiskMark
• Save your registry settings or configuration settings.
• Commit the configuration changes and restart the MailMarshal Receiver service on each node.

Warning: Using the Registry Editor incorrectly can cause serious problems that may require you to reinstall your operating system. Trustwave cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Make sure that you back up your Registry prior to making any changes.

Notes:

• All values are decimal.
• In earlier versions of MailMarshal SMTP, the required free space is 100MB.