Overview

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 determine which specific email was replied to.

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

Need Support?

Our Support Team here at Sinch Mailgun is happy to help! Reach out to us in the Support page of your Mailgun Control Panel, and we'll be with you shortly!