I sent an email, but immediately got a reply saying:
Final-Recipient: rfc822;firstname.lastname@example.org Action: failed Status: 5.0.0 (permanent failure) Diagnostic-Code: smtp; 5.1.2 - Bad destination host 'DNS Hard Error looking up smtpint.xxx.edu (MX): NXDomain' (delivery attempts: 0)
I was wondering
- what this error report means,
- where in the delivery route the error happened,
- who should be contacted to solve this issue and how to solve it?
Thanks and regards! I also appreciate if someone can explain a bit more about the mechanism behind the email delivery.