What potential issues or errors might arise when sending HTML emails through PHP?

One potential issue when sending HTML emails through PHP is that the email may not display correctly in all email clients due to differences in rendering HTML. To ensure compatibility, it's important to inline CSS styles and use table-based layouts. Additionally, be mindful of using relative paths for images and links. 

// Example PHP code snippet for sending HTML email with inline CSS styles and table-based layout

$to = "recipient@example.com";
$subject = "HTML Email Test";

$message = "
<html>
<head>
<style>
  table {
    font-family: Arial, sans-serif;
    border-collapse: collapse;
    width: 100%;
  }
  th, td {
    border: 1px solid #dddddd;
    text-align: left;
    padding: 8px;
  }
</style>
</head>
<body>
<h1>Hello, this is a test email</h1>
<table>
  <tr>
    <th>Name</th>
    <th>Email</th>
  </tr>
  <tr>
    <td>John Doe</td>
    <td>john.doe@example.com</td>
  </tr>
</table>
</body>
</html>
";

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

mail($to, $subject, $message, $headers);

Keywords

SMTP email headers HTML formatting email deliverability PHPMailer

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