What are the best practices for handling email addresses in PHP contact forms to ensure successful delivery?

When handling email addresses in PHP contact forms, it is important to validate the email address to ensure it is in a correct format. This can help prevent errors and ensure successful delivery of the email. One way to validate email addresses is by using PHP's built-in filter_var function with the FILTER_VALIDATE_EMAIL filter. 

// Validate email address
$email = $_POST['email'];

if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
    echo "Invalid email address";
} else {
    // Email address is valid, proceed with sending the email
}

Keywords

email validation PHP mail function SMTP spam filters email headers

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