Are there any best practices for including cc and bc in email headers in PHP to ensure proper delivery?

When sending emails with cc and bcc recipients in PHP, it's important to ensure that the headers are formatted correctly to avoid any delivery issues. To do this, you should separate multiple email addresses with commas and ensure that each email address is properly formatted. 

$to = "recipient@example.com";
$subject = "Example Subject";
$message = "This is a test email.";

$cc = "cc1@example.com, cc2@example.com";
$bcc = "bcc1@example.com, bcc2@example.com";

$headers = "From: sender@example.com\r\n";
$headers .= "Cc: $cc\r\n";
$headers .= "Bcc: $bcc\r\n";

mail($to, $subject, $message, $headers);

Keywords

email headers cc bcc PHP delivery assurance

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