In the provided PHP code examples, what potential pitfalls or mistakes can be identified that may prevent successful email delivery?

Potential pitfalls or mistakes that may prevent successful email delivery include not setting proper headers, not specifying a valid sender email address, and not handling errors or exceptions that may occur during the email sending process. To ensure successful email delivery, make sure to set the "From" header with a valid email address, handle any errors that may occur during the email sending process, and provide proper error messaging to the user if the email fails to send. 

// Set the "From" header with a valid email address
$headers = 'From: sender@example.com';

// Send the email and handle any errors
if (mail($to, $subject, $message, $headers)) {
    echo "Email sent successfully.";
} else {
    echo "Failed to send email. Please try again later.";
}

Keywords

SMTP mail function error handling spam filters email headers

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