How to Configure Database mail in SQL Server

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[banalasiva]

The mail could not be sent to the recipients because of the mail server failure. (Sending Mail using Account 1003 (2021-03-09T@). Exception Message: Could not connect to mail server.(smtp server requires a secure connection or the client was not authenticated the server response was 5.7.0 must issue a STARTTLS command first mu6sm1135567pjb.35 -gsmtp)

[priyadarshnijha]

The mail isn't sent only what I get is security alert on my mail