How should line breaks be handled in email headers when sending HTML emails with PHP?

When sending HTML emails with PHP, line breaks in email headers should be handled by using the PHP `"\r\n"` line break sequence. This ensures that the headers are properly formatted and compliant with email standards. 

// Set email headers with proper line breaks
$headers = "MIME-Version: 1.0" . "\r\n";
$headers .= "Content-type:text/html;charset=UTF-8" . "\r\n";
$headers .= "From: example@example.com" . "\r\n";

// Send email
mail($to, $subject, $message, $headers);

Keywords

PHP email headers line breaks HTML emails handling

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