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What is your landing page? a custom web application or you are free for any suggestion?
If you are free for any suggestion, you can use the Dynamics 365 Portal to directly create Lead when someone submits the web form. And internally you can create a workflow on Lead creation to send the email.If it's on a custom web application, then you will need to integrate with Dynamics 365 via the web API. to create the Lead based on the form information, and using a workflow in Dynamics 365 on lead creation to send the email. If it fails to create the lead for whatever reason, this needs to be handled in your custom web application and using a different approach to send the notification failure email.
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