Overview
The error indicates that Send Email Action has failed to prepare email for sending. It is shown when Fully prepare email message before connecting to the email server option is enabled in Send Email Action properties Options tab.
Cause
Possible cause of Send Email Action to prepare email is either that email settings are incorrect or that error occurs during writing temporary file.
Solution
Check the preceding error message to see what has caused the failure. Verify email settings to ensure their correctness. Verify if the drive on which temp folder is located has enough free space.
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