How can PHP developers troubleshoot and debug email formatting issues specifically for Outlook clients?

To troubleshoot and debug email formatting issues for Outlook clients, PHP developers can ensure that the email template includes inline CSS styles, as Outlook tends to strip out external stylesheets. They can also test the email in Outlook using tools like Litmus or Email on Acid to identify any rendering issues specific to Outlook.

// Example of including inline CSS styles in the email template
$emailBody = '
<html>
<head>
<style>
  body { background-color: #f0f0f0; }
  p { color: #333; }
</style>
</head>
<body>
  <p>This is an example email content.</p>
</body>
</html>
';