If there was no delay between the 'Last update' time and the scheduled time, analyze the email header of the delayed message to determine where the delay occurred.
For instructions on how to get the email headers, see:
The output from either of the above tools will contain a table listing the delay at each server. Contact the service provider for the server with the most delay for further assistance.
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Cause
A significant delay may have occurred at one of the servers involved in the transmission of the email message.
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