XCON: Cannot Configure MTA to Provide Adequate Message Control |
The information in this article applies to:
-
Microsoft Exchange Server, version 5.5
SUMMARY
Microsoft Exchange Server does not support the following features:
- You cannot configure the message transfer agent (MTA) so that all
messages with a given importance level time out after a certain period
of time.
- You cannot configure a given connection so that messages sent through
the connection are stored in the outbound message queue until a certain
number of messages have been stored in the queue, or until the entire
queue has reached a certain size.
- You cannot configure a given connection so that certain types of
messages cannot be sent through the connection. For example, system
messages, non-system messages, or messages sent with urgent, normal, or
low importance.
MORE INFORMATION
Microsoft recognizes the need for the features described above. We have
modified the Exchange Server 5.5 MTA so that the following features are
supported.
NOTE: The override changes mentioned in this article affect the Site and X.400 Connectors using the MTA as their transport.
Priority Time-Outs
After you obtain this feature, you can configure the MTA so that all
messages with a given importance level time out after a certain period of
time. When you obtain the feature, three new registry values are created
under the following key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeMTA
\Parameters
NOTE: The above registry key is one path; it has been wrapped for
readability.
The following registry values are created:
- Value Name: Message timeout (urgent)
Data Type: REG_DWORD
Description: Messages with high importance should time out after the
specified number of minutes.
- Value Name: Message timeout (normal)
Data Type: REG_DWORD
Description: Messages with normal importance should time out after the
specified number of minutes.
- Value Name: Message timeout (non-urgent)
Data Type: REG_DWORD
Description: Messages with low importance should time out after the
specified number of minutes.
If one of the above values is set to 0 (zero), messages with the associated
importance level are never sent. In addition, note that these values do not
apply to system messages.
Threshold Limits
After you obtain this feature, you can configure a connection so that
messages sent through the connection are stored in the outbound message
queue until a certain number of messages have been stored in the queue, or
until the entire queue has reached a certain size. You can also specify
that messages with high importance should be sent immediately, even if the
queue's threshold has not been reached. When you obtain the feature, three
new registry values are created under the following key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeMTA
\Parameters\<connection>
where <connection> is the associated connection.
NOTE: The above registry key is one path; it has been wrapped for
readability.
- Value Name: Content Length Threshold
Data Type: REG_DWORD
Description: Messages are stored in the outbound message queue until
the total size of all the messages reaches the specified
number of kilobytes (KB).
- Value Name: Queue Length Threshold
Data Type: REG_DWORD
Description: Messages are stored in the outbound message queue until
the specified number of messages is stored in the queue.
- Value Name: Urgent Overrides Thresholds
Data Type: REG_DWORD
Description: If this value is set to 1, messages with high importance
are sent immediately, even if the above thresholds have
not been reached. If this value is set to 0, messages with
high importance are not sent until the threshold is
reached.
If the Content Length Threshold or Queue Length Threshold registry value is
set to 0 (zero), the value is ignored. If both registry values are set to a
value other than 0, messages are stored in the queue until either of
the specified thresholds is reached.
Message Type and Priority Restrictions
After you obtain this feature, you can configure a connection so that
certain types of messages cannot be sent through the connection. When you
obtain the feature, six new attributes are created for each connection. The
following attributes are created:
- Attribute: Disallow system
Description: If this value is set to 0x00001000, system messages cannot
be sent through the connection.
- Attribute: Disallow non-system
Description: If this value is set to 0x00002000, non-system messages
cannot be sent through the connection.
- Attribute: Disallow Urgent
Description: If this value is set to 0x00004000, messages with high
importance cannot be sent through the connection.
- Attribute: Disallow Normal
Description: If this value is set to 0x00008000, messages with normal
importance cannot be sent through the connection.
- Attribute: Disallow Low
Description: If this value is set to 0x00010000, messages with low
importance cannot be sent through the connection.
- Attribute: Urgent ignore schedule
Description: If this value is set to 0x00020000, messages with high
priority are sent immediately, even if the connection's
schedule indicates that the message should not be sent
immediately.
These features are included in the latest Microsoft Exchange Server version
5.5 U.S. Service Pack. For information on obtaining the service pack, query
on the following word in the Microsoft Knowledge Base (without the spaces):
S E R V P A C K
Additional query words:
connector heuristic admin administrator program raw mode
Keywords : XCON exc55
Version : winnt:5.5
Platform : winnt
Issue type : kbinfo
