Diagnostic-Code: 5.4.4 DNS error:NXDOMAIN. Domain not found
Hi, I am getting this error .
Both Sender and Recipients email servers are hosted at Zoho.
All MX record as set well.
we can send from other hosting server.
-----Original Message----- From: mailer-daemon@mail.zoho.com <mailer-daemon@mail.zoho.com> Sent: Monday, October 19, 2020 3:40 PM To: XXXXX@mm-ix.net Subject: Undelivered Mail Returned to Sender This message was created automatically by mail delivery software. A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. 'XXXXXXX@optimitycomm.com', ERROR CODE :512 - 5.4.4 DNS error:NXDOMAIN. Domain not found :optimitycomm.com' Reporting-MTA: dns; mx.zohomail.com Arrival-Date: Mon, 19 Oct 2020 15:40:13 +0630 Original-Recipient: rfc822; 'XXXX@optimitycomm.com' Final-Recipient: rfc822; 'XXXXX@optimitycomm.com' Status: 512 Action: failed Last-Attempt-Date: 19 Oct 2020 09:10:20 GMT Diagnostic-Code: 5.4.4 DNS error:NXDOMAIN. Domain not found :optimitycomm.com'
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