Sender address rejected: MX or A record not found

[Osama Tariq]

Email rejected from this domain "example.gc.ca", i have try several time from this email id "[email protected]". Email sent successfully except "[email protected]".
When i have sent email to "[email protected]" from any gmail or hotmail email id, it's sent successfully.

Event:    defer warning
Sender User:    domainorg
Sender Domain:    domain.org.pk
Sender:    [email protected]
Sent Time:    May 5, 2016 5:44:17 PM
Sender Host:    144.76.xxx.xx
Sender IP:    ::1
Authentication:    dovecot_login
Spam Score:    0
Recipient:    [email protected]
Delivered To:
Delivery User:
Delivery Domain:
Router:    dkim_lookuphost
Transport:    dkim_remote_smtp
Out Time:    May 5, 2016 5:44:17 PM
ID:    1ayIdg-002RnL-NV
Delivery Host:    mail6.example.gc.ca
Delivery IP:    198.103.xxx.xxx
Size:    740 bytes
Result:    SMTP error from remote mail server after RCPT TO:<[email protected]>: 450 4.1.8 <[email protected]>: Sender address rejected: MX or A record not found

 

[cPanelMichael]

450 4.1.8 <[email protected]>: Sender address rejected: MX or A record not found

Hello,

You can use a website such as IntoDNS to verify the MX and A records for this domain name exist. Let us know the outcome.

Thank you.

 

[Malcolm Mcneil]

Did you ever get resolution for this. We have same issue with ***.gc.ca. Mail delayed up to 18 hours with that error message then suddenly delivered OK

 

[cPanelMichael]

Did you ever get resolution for this. We have same issue with ***.gc.ca. Mail delayed up to 18 hours with that error message then suddenly delivered OK

Did you encounter any issues with the DNS for the affected domain name? Do you notice any error messages or warnings when using a tool such as IntoDNS to check the DNS records?

Thank you.

 

[Malcolm Mcneil]

There were some errors with Nameservers but nothing crucial I would have thought. MX and A records are fine.

 

[cPanelMichael]

There were some errors with Nameservers but nothing crucial I would have thought. MX and A records are fine.

Check to ensure the hostname of your system has not changed, and that a valid RDNS entry exists.

Thank you.