What potential issues can arise when sending HTML emails with PHP?

Potential issues that can arise when sending HTML emails with PHP include the email being marked as spam due to improper formatting, images not displaying correctly, and CSS styles not rendering properly. To avoid these issues, it is recommended to use inline CSS styles, ensure all image URLs are absolute paths, and thoroughly test the email across different email clients. 

// Example PHP code snippet to send an HTML email with proper formatting
$to = "recipient@example.com";
$subject = "HTML Email Test";
$message = "
<html>
<head>
<style>
  body {
    font-family: Arial, sans-serif;
    background-color: #f0f0f0;
  }
</style>
</head>
<body>
<h1>Hello, this is a test HTML email!</h1>
<p>This is a paragraph of text.</p>
<img src='https://example.com/image.jpg' alt='Image'>
</body>
</html>
";

// Set content type to HTML
$headers = "MIME-Version: 1.0" . "\r\n";
$headers .= "Content-type:text/html;charset=UTF-8" . "\r\n";

// Additional headers
$headers .= 'From: sender@example.com' . "\r\n";

// Send the email
mail($to, $subject, $message, $headers);

Keywords

SMTP email headers MIME HTML rendering spam folder

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