What is the backend code here? PHP, ASP.NET, Node.js?
HTML is not a live code, you cannot execute any command from it — JavaScript can, but you need to get a third-party subscription etc., so, can you tell where you hosted it, so that we can guide you a bit further. There are some ways to do that, in JavaScript, by sending a request to another server with the data and authentication, where they send the email onwards. To do this all by yourself, you can simply integrate a PHP script, or ASP.NET website, and have it do. But what server or hosting is being used here?
How to send an email from JavaScript - Stack Overflow[
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As for the
$omething, please visit a good freelancing website; Upwork etc. They would be interested as well.