SQL server failed to send mail, prompting that the recipient must be specified

SQL SERVER Failed to send email Prompt the following information , The recipient has been configured , But it's still a mistake

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Due to mail server failure , Unable to send message to recipient . ( Use account 1 (2022-07-12T11:09:07) Send E-mail . Exception mail : Unable to send mail to mail server . ( Recipient must be specified .).
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Please tell me the reason , in addition , I am now testing in the local database ,
The configuration is as follows

There is no problem in sending email

Screenshot of error reporting