Email subscription got the error message "The operation has timed out"

Sarah 1 Reputation point
2021-09-04T01:14:37.81+00:00

I create an email subscription, but email delivery failed, and get the below error message in log file

Failure sending mail: The operation has timed out.Mail will not be resent.

ERROR: Error sending email. Exception: System.Net.Mail.SmtpException: The operation has timed out.

I'm using Power BI Report Server, 2016 SQL Server standard Edition, Windows Server 2016

Thanks for your help!

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