I registered my domain at Yahoo! Domain, and used Live mail with my domain (http://domain.live.com).
The service is really very good, mail function correctly. But yesterday, after adding some more MX record to mailgun (a mailing service), I could not use live mail any more. When I try to send an email to my domain email (*** Email address is removed for privacy ***), I received a Mail System Delivery Error, although I re-configued MX record to live mail.
Could you plz tell me what to do, and how to fix this issue? It's very urgent, because my service is running, and I can not receive email from my customer. Plz help me. Thank you.
Error:
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