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MTA Override Properties

Use the MTA Override property page to change the default Microsoft Exchange Server MTA attributes for the Dynamic RAS Connector. Override options should be changed only when you want to match the configuration of a remote Microsoft Exchange Server computer.

Getting to the MTA Override property page

  1. In the Administrator window, choose Connections.
  2. Double-click the Dynamic RAS Connector to be modified.
  3. Select the MTA Override tab.

Setting Override RTS Values

Use the MTA Override property page to match the configuration of the remote Microsoft Exchange Server. This does not affect message transfer over any other connector. If you do not specify an override value, the MTA uses the default values.

  1. Select the MTA Override tab.
  2. Modify the default RTS values as needed.

Option Description
Checkpoint size (K) Sets the amount of data to be transferred before a checkpoint is inserted. If an error occurs and the message must be transferred again, the process restarts from the most recent checkpoint.

If you specify zero, no checkpoint is set. The default is 30.

Using a checkpoint slightly reduces transmission speed. Decrease the checkpoint size when the connection is less reliable.
Recovery timeout (sec) Determines the amount of time after an error occurs that the MTA waits for a reconnection before deleting checkpointed information and restarting the transfer from the beginning. The default is 60.
Window size The number of checkpoints that can go unacknowledged before data transfer is suspended. The greater the window size, the greater the transfer rate. The window size determines the amount of resources set aside for the receiving station.

Specify window size only if the checkpoint size is greater than zero. The default is 5.

Setting Override Connection Retry Values

Use the MTA Override property page to specify how many times the MTA should try to establish a connection.

  1. Select the MTA Override tab.
  2. Modify the default Connection retry values as needed.

Option Description
Max open retries The maximum number of times the system tries to open a connection before it sends a non-delivery report (NDR). The default is 144.
Max transfer retries The maximum number of times the system tries to transfer a message across an open connection. The default is 2.
Open interval (sec) The amount of time to wait before attempting to reopen a connection after an error. The default is 600.
Transfer interval (sec) The amount of time to wait before resending a message across an open connection after a previous attempt failed. The default is 120.

Setting Override Association Parameters

Use the MTA Override property page to set or modify the association parameters between MTAs.

  1. Select the MTA Override tab.
  2. Modify the default Association parameters as needed.

Option Description
Lifetime (sec) The amount of time to keep an association open to a remote system after a message is sent. The default is 300. When using a RAS connection, 30 seconds is the recommended setting.
Disconnect (sec) The amount of time to wait before terminating a connection due to a previously terminated association. The default is 120. When using a RAS connection, 15 seconds is the recommended setting.
Threshold (msgs) The maximum number of queued messages to a remote system. When this is exceeded, the MTA opens another association. The default is 50.

Setting Override Transfer Time-outs

Use the MTA Override property page to set the number of times the MTA will try to transfer urgent, normal, or low priority messages.

  1. Select the MTA Override tab.
  2. Modify the default Transfer timeouts values as needed.

Option Description
Urgent The amount of time (in sec/K) to wait before sending an NDR for an urgent message. The default is 1000.
Normal The amount of time (in sec/K) to wait before sending an NDR for a normal message. The default is 2000.
Non-urgent The amount of time (in sec/K) to wait before sending an NDR for a non-urgent message. The default is 3000.

Resetting Override Default Values

Use the MTA Override property page to reset the values you previously set.

  1. Select the MTA Override tab.
  2. Choose Reset Default Values.