I'm building a mail client which uses a unique identifier to identify (duh) a conversation and by doing so creating a thread. This unique id is now attached to the subject line. Without the id in the subject line the mail gets 'lost'.

Aslında yanı sıra bu i öylesine gibi özel başlığına id ekleyebilirsiniz eğer çok handier olurdu konu satırını Clothers:

$to      = 'nobody@example.com';
$subject = 'the subject';
$message = 'hello';
$headers = 'From: Webmaster <webmaster@example.com>' . "\r\n" .
    'Reply-To: webmaster@example.com' . "\r\n" .
    'X-myID: MghT3s' . "\r\n" .
    'X-Mailer: PHP/' . phpversion();

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

Bu mümkün mü? Ve posta bunu yaparak daha yüksek bir spam puanı almak istiyorsunuz?

//edit By replying to the send email with the custom header, the header is not being transfert, so this is indeed not a solution.

//edit2 I'm looking into the in-reply-to header. But don't know if it's used by all email clients.