# For Enterprise Message Service

Substation ES supports both the reliable and guaranteed service levels for message delivery for Enterprise Message Service.

The following are the service levels that Substation ES support for Enterprise Message Service:

## Reliable Auto Acknowledge

The Enterprise Message Service client library automatically confirms the receipt of a message.

## Reliable No Acknowledge

The Enterprise Message Service client library does not send a receipt of the message during processing.

## Guaranteed All

Substation ES calls the Enterprise Message Service client library and explicitly confirms receipt of a message once after all Substation ES processes and executions controlled by Substation ES for a given message are completed successfully.

## Guaranteed Substation Processing

Substation ES calls the Enterprise Message Service client library and explicitly confirms receipt of a message if the Substation ES processes are completed successfully. Processing is considered complete if a response is successfully delivered to its destination. That rule applies regardless of the type of message (error or application) that is delivered back by Substation ES.

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