php - Mailgun: How to keep track of the Message-ID (and References and In-Reply-To) to build threads -
i using mailgun api. want keep thread when reply mail using mailgun api.
let me explain. fetch mail using imap. have message_id,subject,text,sender mail etc. reply mail using mailgun api. here face problem. replied same subject email-id person mail new mail. thread not generated. in php mailer find following way thread generated. how create thread using mailgun api.
$mail->addcustomheader('in-reply-to', $message_id); $mail->addcustomheader('references', $message_id);
thanks in advance.
finally got solution. hope someone.
$mail->addheader('your-header', 'value');
example:
$mail->addheader('reply-to', $message_id);
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