SQL Database Email is not working...

I have configured Database Mail in SQL Server 2016.
But when I Send Test E-Mail, I did not receive any email.
Actually I have followed the same exact steps I used to configure it in a different server and all the things are fine including credentials.

Then I used the below query to check the status of it
SELECT * FROM msdb..sysmail_mailitems WHERE send_request_date > DATEADD(DAY, -1,GETDATE())

According to that sent_status=0. That means that request is new or not sent.
Then I find the DatabaseMail application file in the below path and double click on it.
\Program Files\Microsoft SQL Server\MSSQL13.MSSQLSERVER\MSSQL\Binn


 Then I got the below message



I checked the Features and .Net Framework 3.5 is not installed yet.



When it is installed, Database Mail is started to work fine.

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