Note: A return email will be sent to the from adress when the email is read.
<form method="POST" action="/">
    To: <input type="email" name="to"><br>
    Subject: <input name="subject"><br>
    Message: <textarea name="message"></textarea><br><br>
    
    <b>SMTP</b>
    <br>
    Host: <input name="smtp"><br>
    Port: <input type="number" name="port"><br>
    
    Username: <input name="username"><br>
    Password: <input type="password" name="password"><br>
    
    From: <input name="from"><br>
    <input type="submit">
</form>