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Mailgun: How to keep track of the Message-ID (and References and In-Reply-To) to build threads

I am using mailgun API. I want to keep thread when I reply to mail using Mailgun API.

Let me explain. I fetch mail using IMAP. I have message_id,subject,text,sender mail etc. Now I reply to that mail using Mailgun API. Here i face problem. I replied with same subject to that email-id but that person get mail as a new mail. Thread is not generated. In Php Mailer i find following way so thread is generated. But how to create thread using Mailgun API. 

$mail->AddCustomHeader('In-Reply-To', $message_id);
$mail->addCustomHeader('References', $message_id);

Thanks in advance.

Solution

  • Finally i got solution. Hope this will help someone.

    $mail->addHeader('Your-Header', 'value');

    example:

    $mail->addHeader('Reply-to', $message_id);