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It was low on space. The thing that threw me off was in information in the event log. Usually it would read something like this:<br />
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Event Type: Error<br />
Event Source: MSExchangeTransport<br />
Event Category: Resource Manager<br />
Event ID: 15006<br />
Description: The Microsoft Exchange Transport service is rejecting messages because available disk space is below the configured threshold. Administrative action may be required to free disk space for the service to continue operations.
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Does that mean the issue is resolved for you after freeing up sufficient disk space?
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Yes,mail flow started working after clearing out space. My question is: why the event ID did not provide the correct description.
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I would suspect that because disk space was so low that the transport service wasn't running and that's why the event was written the way it was. &nbsp;Maybe the managed assistant was attempting to fix something at the same time the event was written. &nbsp;Not seeing the entire context of the event, I can only guess.<br />
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Do you have an antivirus product on the specific server?
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Sufficient information provided to achieve resolution.
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<div class="content wysiwyg-content">
Have any of you seen this information for Event ID 15006?<br />
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The description for Event ID 15006 from source MSExchangeTransport cannot be found. Either the component that raises this event is not installed on your local computer or the installation is corrupted. You can install or repair the component on the local computer.<br />
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If the event originated on another computer, the display information had to be saved with the event.<br />
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The following information was included with the event: <br />
<br />
<br />
the message resource is present but the message is not found in the string/message table
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Have any of you seen this information for Event ID 15006?

The description for Event ID 15006 from source MSExchangeTransport cannot be found. Either the component that raises this event is not installed on your local computer or the installation is corrupted. You can install or repair the component on the local computer.

If the event originated on another computer, the display information had to be saved with the event.

The following information was included with the event: 


the message resource is present but the message is not found in the string/message table

Exchange 2013 Event ID 15006 not the usual error

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.