Missing Transport Event Sink Binding
[This topic is intended to address a specific issue called out by the Exchange Server Analyzer Tool. You should apply it only to systems that have had the Exchange Server Analyzer Tool run against them and are experiencing that specific issue. The Exchange Server Analyzer Tool, available as a free download, remotely collects configuration data from each server in the topology and automatically analyzes the data. The resulting report details important configuration issues, potential problems, and nondefault product settings. By following these recommendations, you can achieve better performance, scalability, reliability, and uptime. For more information about the tool or to download the latest versions, see "Microsoft Exchange Analyzers" at http://go.microsoft.com/fwlink/?linkid=34707.]
Topic Last Modified: 2009-03-16
The Microsoft® Exchange Server Analyzer Tool queries the Microsoft Internet Information Server (IIS) metabase to enumerate the list of Simple Mail Transport Protocol (SMTP) transport event sink bindings. The Exchange Server Analyzer tries to locate several standard event bindings, based on the following list that is pre populated in the Exchange Server Analyzer:
Custom Exchange DSN Sink
EHLO Inbound Command Handler Sink for XLSA
EHLO Response Handler Sink for X-LSA
EOD Inbound Command Handler Sink
Exchange NTFS Store Driver
Exchange SMTP Protocol Logging Sink
Exchange SMTP Protocol Security EHLO Sink
Exchange SMTP Protocol Security EXPS Sink
Exchange SMTP Protocol Security EXPS-Aux Sink
Exchange SMTP Protocol Security EXPS-EOD Sink
Exchange SMTP Protocol Security Mail Sink
Exchange SMTP Protocol XEXCH50 Before Data Sink
Exchange SMTP Protocol XEXCH50 EHLO Response Sink
Exchange SMTP Protocol XEXCH50 EOD Sink
Exchange SMTP Protocol XEXCH50 Inbound EHLO Sink
Exchange SMTP Protocol XEXCH50 Inbound MAIL Sink
Exchange SMTP Protocol XEXCH50 Inbound RCPT Sink
Exchange SMTP Protocol XEXCH50 Inbound XEXCH50 Sink
Exchange SMTP Protocol XEXCH50 per recipient event Sink
Exchange SMTP Protocol XEXCH50 RCPT Response Sink
Exchange SMTP Protocol XEXCH50 Response Sink
Exchange Store Driver
Exchange Transport AntiVirus API
Exchange Transport XEXCH50 Submission Sink
MAIL Inbound Command Handler Sink for TURF
MSExchange Content Filter EOD Sink
RCPT Inbound Command Handler Sink
SMTP Eventlog Sink
X-LSA Inbound Command Handler Sink
X-LSA Response Handler Sink
If the Exchange Server Analyzer finds that one or more standard event bindings are missing, the Exchange Server Analyzer generates a warning.
An SMTP transport event occurs when message data is transported into or out of the SMTP service. All messages go through events. These include X.400 and RPC incoming or outgoing messages. One common example of an inbound transport event is the arrival of a message to the SMTP service either over the network or in the SMTP pickup directory. When this transport event occurs, a source for this event notifies the transport event sinks, each of which can take some type of action based on the data content of the message. The system performs no other action with the message data after it passes the message data to the sink until the sink completes its action and returns the message. The sink has exclusive control of the message data and state while it performs this action.
Missing transport event sink bindings can cause mail flow problems. If the Exchange Server shows symptoms of mail flow problems such as message queuing, reregister the transport event sinks.
To reregister the transport event sinks
From the Microsoft Exchange Server, open a Command Prompt window and change to the \Program Files\Exchsrvr\Bin folder.
Type the following commands to reregister transport event sinks:
Restart the Simple Mail Transfer Protocol service.
Rerun the Exchange Server Analyzer to verify that the warnings are no longer present. If event sink warnings continue to occur and you experience mail flow problems, contact Microsoft Product Support Services (PSS).
For more information about transport event sink bindings see the following Exchange resources:
Microsoft Knowledge Base article 258224, "XCON: Enumerating the Registered Transport Event Sinks" (http://go.microsoft.com/fwlink/?linkID=3052&kbid=258224)
"SMTP Service Design" in the Technical Reference Guide for Exchange Server 2003 (http://go.microsoft.com/fwlink/?LinkId=58876)