What are some common mistakes to avoid when sending HTML newsletters via PHP to ensure consistent display across different email clients?

Common mistakes to avoid when sending HTML newsletters via PHP include using inline styles instead of embedded or external stylesheets, not including plain text versions of the email, and not testing the email across different email clients to ensure consistent display. 

// Example PHP code snippet to send HTML newsletter with embedded stylesheets and plain text version

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

// Set plain text version of the email
$plain_text_message = "This is the plain text version of the email.";

// HTML content of the email with embedded stylesheets
$html_message = "
<!DOCTYPE html>
<html>
<head>
<style>
  /* Embedded styles */
</style>
</head>
<body>
  <h1>Hello World!</h1>
  <p>This is the HTML content of the email.</p>
</body>
</html>
";

// Send email with both HTML and plain text versions
mail($to, $subject, $html_message, $headers);

Keywords

HTML newsletters PHP email clients consistent display mistakes

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