Are there any security implications to consider when sending emails to multiple recipients in PHP?

When sending emails to multiple recipients in PHP, it is important to use the BCC (Blind Carbon Copy) field to prevent exposing all recipient email addresses to each other. This helps protect the privacy of the recipients and reduces the risk of email addresses being harvested for spam or phishing purposes. 

$to = 'recipient1@example.com, recipient2@example.com';
$subject = 'Subject of the email';
$message = 'This is the message content';

$headers = 'From: sender@example.com' . "\r\n";
$headers .= 'Bcc: anotherrecipient@example.com' . "\r\n";

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

Keywords

PHP email security multiple recipients BCC

Related Questions