A non-SMTP Gateway Connection failure has occurred on the specified connector: The Drop Directory Quota limit has been exceeded


Topic Last Modified: 2007-02-01

The Microsoft Exchange Server 2007 Management Pack for Operations Manager monitors the Windows Application log on computers that are running Exchange Server 2007 and generates this alert when the event or events specified in the following Details table are logged.

To learn more about this event, do one or more of the following:

  • Review the description of the event that includes the variables specific to your environment. From the Operator Console, select this alert, and then click the Properties tab.

  • Review all events that have been logged that meet the criteria of this Operations Manager alert. From the Operator Console, click the Events tab, and then double-click the event in the list for which you want to review the event description.


Product Name


Product Version

8.0 (Exchange Server 2007)

Event ID


Event Source


Alert Type


MOM Rule Path

Microsoft Exchange Server/Exchange 2007/Common Components/Hub Transport and Edge Transport/Transport

MOM Rule Name

A non-SMTP Gateway Connection failure has occurred on the specified connector: The Drop Directory Quota limit has been exceeded.


This Error event indicates that the Drop directory that is used by a Foreign connector has exceeded its maximum allowed size.

The maximum size of the Drop directory is specified by using the DropDirectoryQuota parameter on the Set-ForeignConnector cmdlet. By default, the value of the DropDirectoryQuota parameter is unlimited.

Each Foreign connector that is configured on a Hub Transport server uses a specified Drop directory to send messages to a local messaging server that is called a foreign gateway server. A foreign gateway server does not use the Simple Mail Transfer Protocol (SMTP) as its primary transport mechanism. All outbound messages that are sent to address spaces that are defined by a Foreign connector are put in the specified Drop directory.

User Action

To resolve this error, do one of the following:

  • Remove files from the specified Drop directory until the size of all files in the Drop directory is less than the value that is specified by the DropDirectoryQuota parameter.

  • Increase the value of the DropDirectoryQuota parameter on the Set-ForeignConnector cmdlet. The valid input range is 1 B to 2 GB. You can also remove the maximum allowed size on the specified Drop directory by setting a value of unlimited.

For more information, see How to Configure the Drop Directory of a Foreign Connector.

For More Information

To search the Microsoft Knowledge Base articles based on criteria that generated this alert, visit the Search the Support Knowledge Base (KB) Web site.

To review Exchange 2007 event message articles that may not be represented by Exchange 2007 alerts, see the Events and Errors Message Center.

If you are not already doing so, consider running the tools that Microsoft Exchange offers to help administrators analyze and troubleshoot their Exchange environment. These tools can help you make sure that your configuration is in line with Microsoft best practices. They can also help you identify and resolve performance issues, improve mail flow, and better manage disaster recovery scenarios. Go to the Toolbox node of the Exchange Management Console to run these tools now. For more information about these tools, see Toolbox in the Exchange Server 2007 Help.