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How do I track which email a recipient has replied to?

This has been a popular question, so we wrote a blog post about it.

The Message-ID in the original email is included in the In-Reply-To header in the reply email. So you can use that to track which specific email was replied to.

Mailgun will automatically include a unique Message-ID or you can set your own.

Got Questions?

Sinch Mailgun has answers! If you have any concerns or questions, please send us a Support ticket using the Support page within your Mailgun Control Panel.  Our Support Team will be happy to assist!