What potential issues could arise when trying to send HTML emails using PHP?

One potential issue when sending HTML emails using PHP is that the email may not render correctly in all email clients due to differences in how each client interprets HTML. To solve this, it is recommended to use inline CSS styles and test the email in multiple email clients to ensure compatibility. 

// Example PHP code snippet for sending HTML email with inline CSS styles

$to = "recipient@example.com";
$subject = "HTML Email Test";
$message = "
<html>
<head>
<style>
  body {
    font-family: Arial, sans-serif;
    background-color: #f1f1f1;
  }
  h1 {
    color: #333333;
  }
</style>
</head>
<body>
<h1>Hello, this is a test HTML email!</h1>
<p>This is a test email with inline CSS styles.</p>
</body>
</html>
";

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

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

Keywords

SMTP email headers MIME PHPMailer deliverability

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