Sender address rejected: MX or A record not found

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

Event:    defer warning
Sender User:    domainorg
Sender Domain:    domain.org.pk
Sender:    abc@domain.org.pk
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:    someusrname@example.gc.ca
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:: 450 4.1.8 : Sender address rejected: MX or A record not found

cPanelMichael

May 11, 2016 16:55

4.1.8 : 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

October 25, 2016 23:37

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

October 27, 2016 20:40

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.

October 28, 2016 01:39

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

November 01, 2016 19:12

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

Sender address rejected: MX or A record not found

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