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How can I determine whether a recipient has replied to an email?

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    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.

     

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