System emails/process emails are no longer being sent with an "Email body failed to render... Connection refused" error

Symptoms

When attempting to reset a password or use the send E-Mail smart service, the logs will the contents of the email, but the user will never receive the message.

The application server log will show the following error:

Exception:
javax.resource.spi.work.WorkCompletedException: com.appiancorp.process.engine.EmailBodyException: Email body failed to render: MailBody{<FILE_PATH>}

...
Caused by: javax.ejb.EJBException: com.appiancorp.process.engine.EmailBodyException: Email body failed to render: MailBody{<FILE_PATH>}

...

Caused by: com.appiancorp.process.engine.EmailBodyException: Email body failed to render: MailBody{<FILE_PATH>}

...

Caused by: java.net.ConnectException: Connection refused (Connection refused)

Cause

Action

Workaround

Affected Versions:

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