How can PHP developers integrate email forwarding to groups functionality seamlessly with existing email clients?

To integrate email forwarding to groups functionality seamlessly with existing email clients, PHP developers can create a script that fetches incoming emails from a designated email account, identifies the group recipients, and forwards the email to each member of the group individually.

<?php
// Fetch incoming emails
$inbox = imap_open('{imap.example.com:993/ssl}INBOX', 'username', 'password');
$emails = imap_search($inbox, 'UNSEEN');

foreach ($emails as $email_number) {
    $email_header = imap_headerinfo($inbox, $email_number);
    $group_recipients = ['recipient1@example.com', 'recipient2@example.com', 'recipient3@example.com'];

    foreach ($group_recipients as $recipient) {
        $forwarded_email = imap_mail_compose([
            'to' => $recipient,
            'subject' => $email_header->subject,
            'body' => imap_body($inbox, $email_number)
        ]);

        imap_send($inbox, $forwarded_email);
    }

    imap_setflag_full($inbox, $email_number, "\\Seen");
}

imap_close($inbox);
?>