What potential issue arises when sending multiple emails to the same email address using PHP scripts?

The potential issue that arises when sending multiple emails to the same email address using PHP scripts is that the recipient may receive multiple copies of the same email, leading to spam or annoyance. To solve this issue, you can use the "Bcc" (Blind Carbon Copy) header in the email headers to send a single email to multiple recipients without revealing their email addresses to each other. 

$to = 'recipient@example.com';
$subject = 'Subject of the email';
$message = 'Message content of the email';
$headers = 'From: sender@example.com' . "\r\n";
$headers .= 'Bcc: recipient1@example.com, recipient2@example.com' . "\r\n";

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

Keywords

email address duplicate SMTP error

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