Insufficient permissions for setting the configuration property 'port'

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ASP.NET

We have developed the web page on dot net for sending email from website
This was working fine in the local machine and in our servers too.

But when we host it to your server, it’s not allowing to send the email. It’s given the error as "insufficient permissions for setting the configuration property 'port'. "


Below is the error, which comes when we try to send email.

Insufficient permissions for setting the configuration property 'port'. (D:\wwwroot_Fusion\Rollout\web.config line 21)

this code, I am using my web.config:

<system.net>
    <mailsettings>
      <smtp from="abc@gmail.com">
        <network host="smtp.gmail.com" port="587" />
      </smtp>
    </mailsettings>
  </system.net>