Error, fail, bounce and reply mails back to sender (application)
Bounce mails dont came back to senders e-mail account, tracking is impossible without API. Routed e-mails need reply information, feature will make Mailgun perfect.
Pete Schaefers commented
Yes, it is a duplicate, and this SHOULD be done! It's a deal killer for many applications. I want to use MG as SMTP for hosting servers, but this lacking feature makes that impossible to consider. Please upvote here: https://mailgun.uservoice.com/forums/156243-general/suggestions/5707098-provide-option-to-send-non-delivery-reports-to-the
Andrew Bucklin commented