How to create own mail application using html

Creating a mail application using HTML is a complex task that requires a good understanding of HTML, CSS, JavaScript, and email protocols. Here's a high-level overview of the steps involved:

Step 1: Design the UI

Step 2: Handle Form Submission

Step 3: Send Email using SMTP

Step 4: Display Email List

Step 5: Implement Email Composition

Step 6: Implement Email Reading

Here's some sample HTML code to get you started:

<!-- index.html -->

<!DOCTYPE html>
<html>
<head>
  <title>My Mail App</title>
  <style>
    /* Add some basic styling to the page */
    body {
      font-family: Arial, sans-serif;
    }
    #email-list {
      list-style: none;
      padding: 0;
      margin: 0;
    }
    #email-list li {
      padding: 10px;
      border-bottom: 1px solid #ccc;
    }
  </style>
</head>
<body>
  <h1>My Mail App</h1>
  <form id="compose-form">
    <label for="to">To:</label>
    <input type="email" id="to" name="to"><br><br>
    <label for="subject">Subject:</label>
    <input type="text" id="subject" name="subject"><br><br>
    <label for="body">Body:</label>
    <textarea id="body" name="body"></textarea><br><br>
    <button type="submit">Send</button>
  </form>
  <ul id="email-list"></ul>

  <script src="script.js"></script>
</body>
</html>

And here's some sample JavaScript code to get you started:

// script.js

// Get the form and email list elements
const composeForm = document.getElementById('compose-form');
const emailList = document.getElementById('email-list');

// Handle form submission
composeForm.addEventListener('submit', (e) => {
  e.preventDefault();
  const to = document.getElementById('to').value;
  const subject = document.getElementById('subject').value;
  const body = document.getElementById('body').value;
  // Send the email data to the server or SMTP server
  //...
});

// Fetch the email list from the server or mail server
fetch('/emails')
 .then((response) => response.json())
 .then((emails) => {
    // Display the email list
    emailList.innerHTML = '';
    emails.forEach((email) => {
      const li = document.createElement('li');
      li.textContent = `${email.from}: ${email.subject}`;
      emailList.appendChild(li);
    });
  });

This is just a basic example to get you started. Creating a fully functional mail application using HTML is a complex task that requires a good understanding of email protocols, security, and user interface design.