What are the potential security risks when sending mass emails with PHP?

When sending mass emails with PHP, one potential security risk is exposing email addresses in the "To" field, which can lead to privacy concerns or potential spamming. To mitigate this risk, it is recommended to use the BCC (Blind Carbon Copy) field to send emails to multiple recipients without revealing their email addresses to each other. 

$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: ' . $to . "\r\n";

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

Keywords

SQL injection cross-site scripting email headers injection SMTP authentication SPF records

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