Sending Message to One Recipient - Contact Form

I’ve got a contact form in my app. All the tutorials I’m seeing online show creating a form which then populates an email in the phones default email client. Is there a way to send a message directly from the app? Are there any tutorials on this. I’m guessing a need some kind of mail library such as mailgun.js. Or am I complicating things? The recipient will always be the same as it is a contact us form so the default email client route is not what I want. I also don’t want it to be an SMS. Just an email generated and sent from in the app.