|Component:||Microsoft Exchange Transport|
|Message:||Because the Exchange MTA is disabled, the store driver cannot deliver the message recipient:text to the recipient recipient|
This Error event indicates that one or more messages could not be delivered by the information store because the Exchange MTA Stacks service is disabled.
If you have also logged Event 3015 from MSExchangeTransport, you should consider the causes of that event when troubleshooting Event 340. Event 3015 can be logged for the following reasons:
To resolve this issue, try one of the following:
If the previous steps do not solve the problem, you may have to uninstall or unregister any third-party transport sinks.